Answers
The density of a metal block that has a mass of 250.00 grams and the length is 16.25 cm, the width is 2.30 cm, and the height is 6.00 cm is 1.11.
What is density?Density can be defined as the measurement of how tightly a material is pecked together. It is defined as mass per unit volume.
Its SI unit is g/cm3 .
Density can be expressed as
Density = mass/ volume
Volume of metal block = length x width x height
= 16.25 x 2.30 x 6.00
= 224.3 ml
Density = 250.0 / 224.3 g/ml
= 1.11 g/ml
Thus, the density of a metal block that has a mass of 250.00 grams and the length is 16.25 cm, the width is 2.30 cm, and the height is 6.00 cm is 1.11.
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Related Questions
Starting with 0.3500 mol CO(g) and 0.05500 mol COCl2(g) in a 3.050 L flask at 668 K, how many moles of CI2(g) will be present at equilibrium?
CO(g) + Cl2(g)》COCl2(g)
Kc= 1.2 x 10^3 at 668 K
Answers
At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.
1: Write the balanced chemical equation:
\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)
2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.
Initial:
\(C_O\)(g) = 0.3500 mol
\(Cl_2\)(g) = 0.05500 mol
\(C_OCl_2\)(g) = 0 mol
Change:
\(C_O\)(g) = -x
\(Cl_2\)(g) = -x
\(C_OCl_2\)(g) = +x
Equilibrium:
\(C_O\)(g) = 0.3500 - x mol
\(Cl_2\)(g) = 0.05500 - x mol
\(C_OCl_2\)(g) = x mol
3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:
Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]
4: Substitute the given equilibrium constant (Kc) value into the expression:
1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)
5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:
1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x
6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.
7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.
8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):
\(Cl_2\)(g) = 0.05500 - x
9: Calculate the value of \(Cl_2\)(g) at equilibrium:
\(Cl_2\)(g) = 0.05500 - x
\(Cl_2\)(g) = 0.05500 - (positive value of x)
10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.
Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.
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When two atoms are being held together by an ionic bond, which of the following statements is accurate?
a. Each of the two atoms had a full outer orbital before the bond occurred.
b. The two atoms share an electron.
c. One atom is now positively charged and the other is negatively charged.
d. The two atoms have identical atomic numbers.
Answers
Correct option is c) One atom is now positively charged, and the other is negatively charged. This is due to nature of ionic bond.
An ionic bond is formed when one or more electrons are transferred from one atom to another, resulting in the formation of two oppositely charged ions. In an ionic bond, the electron(s) transferred from one atom are accepted by the other atom, leading to the formation of cations and anions.
The atom that loses an electron becomes a positively charged ion (cation), and the atom that gains an electron becomes a negatively charged ion (anion). The opposite charges of the ions attract each other and form an ionic bond between the two atoms.
Ionic bonds usually occur between atoms of different elements with a significant difference in electronegativity. Ionic compounds generally have high melting and boiling points, are solid at room temperature, and are usually soluble in water.
In contrast to an ionic bond, a covalent bond is formed when atoms share electrons, as in the case of molecular compounds. In a covalent bond, atoms do not become charged. Instead, they share electrons in a way that allows them to complete their valence shells.
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The measure of the length of events and the duration of intervals between events
Answers
The measure of the length of events and the duration of intervals between events is time.
What is time?The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon formal geologic time runs until the present. Geology is defined as the "Science of the Earth."
Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.
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Convert 100.6 Kelvin to degrees C.
°C = K - 273
[?] °C
Answers
Answer:
-172.6 °C
Explanation:
You want to know the Celsius equivalent of the temperature 100.6 K.
ConversionThe relation is ...
C = K - 273.15
C = 100.6 -273.15 = -172.55
The temperature is -172.55 °C, about -172.6 °C.
__
Additional comment
We have rounded to tenths, because that is precision of the temperature given. If you use 273 as the conversion constant, you will get -172.4.
According to one acid-base theory, a molecule acts as an acid
when the molecule
(1) accepts an H+
(2) accepts an OH-
(3) donates an H+
(4) donates an OH-
Answers
The Brnsted-Lowry acid-base hypothesis states that when a molecule gives a proton (H+ ion) to another molecule, it behaves as an acid. As a result, the right response is (3) donates an H+.
According to one acid base theory, what is an acid?The Arrhenius theory states that acid is a chemical that causes water to create hydrogen ions. Base is a chemical that causes water to form hydroxide ions.
What underlies acid-base titration's basic premise?A neutralisation reaction takes place during the acid-base titration. Here, the concentration of a particular base or acid is ascertained by neutralisation against an acid or base of known concentration. This kind of titration begins with a drop of an indicator, which changes colour to show the endpoint.
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Two identical coolers are packed for a camping. Each cooler is packed with ten-one liter softdrinks and 1.5 kg of ice. The softdrinks that were packed in cooler A were first put inside the refrigerator for 8 hours, while the softdrinks that were packed in cooler B were only kept at room temperature for 8 hours also. When the campers opened the coolers after 4 hours later, most of the ice in cooler A is still ice, while almost all of the ice in cooler B have already melted. Explain what happened with the two coolers.
Answers
Answer:
Explanation:
The drinks that were put into cooler A have lower temperatures than the drinks that were put into cooler B.
As heat flows from high temperature to low temperature until it reaches equilibrium, more heat flows from the drinks to ice in cooler B than the heat flows from the drinks to ice in cooler A.
Thus, most of the ice in cooler B is melted as heat is transferred to the ice that results in its phase change.
The soft drinks in cooler B had higher thermal energy than the soft drinks in cooler A. Therefore, greater thermal energy flowed from the drinks in cooler B to ice, causing it to melt faster.
When the soft drinks are placed in ice, thermal energy flows from the object having a higher temperature to the object at a lower temperature until thermal equilibrium is achieved between the two bodies.
Note that the temperature difference between the soft drinks in cooler B and ice is much higher compared to the temperature difference between the soft drinks in cooler A and ice.
The reason behind this is that the soft drinks in cooler A were kept in a refrigerator for 8 hours while the soft drinks in cooler B were kept at room temperature for 8 hours.
When both groups of soft drinks were added to different coolers with the same 1.5 kg of ice, thermal equilibrium was attained in both cases.
The soft drinks in cooler B transferred more energy to the ice in four hours causing it to melt faster compared to the amount of energy transferred to it by the soft drinks in cooler B. The energy between the soft drinks in cooler A and ice were minimal hence the soft drinks in cooler A still remained ice after 4 hours.
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Learn more:
How many formula units are in 14.5 moles of H₂SO4?
Answers
There are 8.73 × 10²⁴ formula units in 14.5 moles of sulfuric acid.
How to calculate formula units?Formula units is an empirical formula of an ionic compound (that does not possess individual molecules) for use in stoichiometric calculations.
The formula unit can be calculated by multiplying the number of moles in a substance by Avogadro's number (6.02 × 10²³).
According to this question, there are 14.5 moles in sulfuric acid. The formula unit can be calculated as follows:
Formula units of sulfuric acid = 14.5 × 6.02 × 10²³
Formula units = 8.73 × 10²⁴ formula units
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Aluminum can be made by reducing alumina Al2O3 by carbon in the reaction equation
2 Al2O3 + 3 C → 4 Al + 3 CO2
according to. How much carbon is needed to reduce Al2O3 to produce 491 grams of pure aluminum? To give an answer to the gram, be sure to add the unit g after the numerical value of your answer.
Answers
Taking into account the reaction stoichiometry, 163.67 grams of C is needed to reduce Al₂O₃ to produce 491 grams of pure aluminum.
Reaction stoichiometryIn first place, the balanced reaction is:
2 Al₂O₃ + 3 C → 4 Al + 3 CO₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al₂O₃: 2 molesC: 3 molesAl: 4 molesCO₂: 3 molesThe molar mass of the compounds is:
Al₂O₃: 102 g/moleC: 12 g/moleAl: 27 g/moleCO₂: 44 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al₂O₃: 2 moles ×102 g/mole= 204 gramsC: 3 moles ×12 g/mole= 36 gramsAl: 4 moles×27 g/mole= 108 gramsCO₂: 3 moles×44 g/mole= 132 gramsMass of carbon requiredThe following rule of three can be applied: if 108 grams of Al are produced by 36 grams of C, 491 grams of Al are produced by how much mass of C?
mass of C= (491 grams of Al× 36 grams of C)÷ 108 grams of Al
mass of C= 163.67 grams
Finally, 163.67 grams of C is required.
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Formaldehyde has a wide range of uses, many of them in manufacturing. Its chemical formula is CH₂O. The model below represents formaldehyde.
Based on the model, which statement best describes formaldehyde molecules?
A. Formaldehyde molecules form an extended structure and cannot freely move past each other.
B. Formaldehyde molecules do not form an extended structure and can freely move past each other.
C. Formaldehyde molecules do not form a repeating pattern and cannot freely move past each other.
D. Formaldehyde molecules form a repeating pattern and can freely move past each other.
Answers
Answer: B
Explanation: Formaldehyde molecules do not form an extended structure and can freely move past each other
Explain two positive aspects of using methane recapture systems.
Answers
Answer:
Two positive aspects of using methane recapture systems are able to generate significant electricity. Another benefit is that the process of anaerobic digestion creates heat that can be used to warm buildings where animals are kept
Answer: The correct answer is;
Two positive aspects of using methane recapture systems include lowering the impact on greenhouse gasses and the production of energy. Methane is a very potent greenhouse gas that is contributing to global warming. As a result, the recapturing process reduces the methane impacts of global warming by reclaiming and reusing the gas for other purposes. Recaptured methane can be stored and used to generate electricity or used as fuel to power updated vehicles and other engines on the farm. The overall benefits from this combination are reducing impacts causing global warming and lower the cost of electricity or fuel on the farm.
Explanation: This answer has been confirmed correct.
if excess co were to react with 30.0 g of no in a 6.00 l container held at 298k what will be the partial pressures of n2 after the reaction completes
Answers
After the reaction is finished, N2 has a partial pressure of 0.995 atm.
How can the speed of a chemical process be accelerated?Provide three strategies for accelerating a chemical reaction. providing heat, increasing the reactants' surface area or concentration, or adding a catalyst are all ways to raise the temperature.
What is the name of the chemical reaction-inducing substance?A catalyst is a chemical that can be included in a reaction to speed up the process without being consumed. Catalysts typically reduce a process's activation energy or change its mechanism. Proteins called enzymes serve as catalysts in biological reactions.
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What is the edge length of a 377-g iron cube? (The density of iron is 7.86 g/cm^3, and the volume of a cube is equal to the edge length cubed.)
Answers
Answer:3.50 cm
Explanation:
Answer:
3.63cm
Explanation:
Which organic compound has a branched hydrocarbon group. Select one: a. 2-propanol. b. normal propyl acetate. c. acetone. d. 2-butanone.
Answers
The correct option is D. 2-butanone organic compound has a branched hydrocarbon group.
Natural compounds are a substance that consists of covalently- bonded carbon and hydrogen and frequently with other elements. organic compounds examples are benzoic Acid, fragrant compounds, benzoic aldehyde, propanoic acid, butanoic acid, malonic acid, amines, heterocyclic compounds, VOC, benzoic acid, and diethyl malonate.
In chemistry, many authors bear in mind that an organic compound is any chemical compound that includes carbon-hydrogen or carbon-carbon bonds, although, the definition of "natural" versus "inorganic" varies from author to writer, and it's far a subject of debate. The chemicals of living matter are called organic compounds due to their affiliation with organisms and due to the fact they're carbon-containing compounds. organic compounds, which are the compounds associated with existence procedures, are the difficult count of a number of natural chemistry.
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50.0 grams of a pure gaseous compound was
found to contain 30 grams of poxygen. What
is the percentage by weight of oxygen in this
compound?
Answer in units of %.
Answers
Answer:
To find the percentage by weight of oxygen in the gaseous compound, we need to first find the weight of the compound that is not oxygen. We can do this by subtracting the weight of the oxygen from the total weight of the compound: 50.0 grams - 30.0 grams = 20.0 grams.
Next, we need to divide the weight of the oxygen by the total weight of the compound and multiply the result by 100% to express the answer as a percentage: 30.0 grams / 50.0 grams * 100% = 60.0%.
Therefore, the percentage by weight of oxygen in the gaseous compound is 60.0%.
Explanation:
Predict the product when 2-methylbutanol is oxidised with pyridium chlorochromate in dichloromethane (PCC/CH2C12) a. CH3CH2CH(CH3)COOH b. CH3CH2CH2CH(CH3)CHO C. CH3CH2CH(CH3)CHO d. CH3CH2CH(CH3)OH 8:40 PM Type a message
Answers
Answer:
c. CH3CH2CH(CH3)CHO
Explanation:
Hello there!
In this case, according to the process for the one-step oxidation of a primary alcohol with a moderately strong oxidizing agent like pyridinium chlorochromate (PCC), whereby an aldehyde is produced, we infer that the corresponding product will be 2-methylbutanal, which matches with the choice c. CH3CH2CH(CH3)CHO according to the following reaction:
\(CH_3CH_2CH(CH_3)CH_2OH\rightarrow CH_3CH_2CH(CH_3)COH\)
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A block with a volume of 20 cm3 has a density of 5 g/cm3. The block is cut into two pieces. One piece has a volume of 15 cm3, and the other piece has a volume of 5 cm3. What are the densities of the two pieces?
Answers
Answer:
wouldnt they still have the same density?
Explanation:
for example, the density of iron is 7.874 g/cm^3 no matter how big the piece is. I hope this helps.
6NaCl + Ba3P2 - 3BaCl₂ + 2Na3P
If 17 moles sodium phosphide is produced, how many moles of sodium chloride is needed?
Round to the nearest hundredths.
Answers
6NaCl + Ba3P2 -> 3BaCl₂ + 2Na3P
We can see that for every 2 moles of Na3P, we need 6 moles of NaCl. This means there is a 3:1 molar ratio between NaCl and Na3P.
If 17 moles of Na3P is produced, we can calculate the moles of NaCl needed as follows:
17 moles Na3P * (6 moles NaCl / 2 moles Na3P) = 51 moles NaCl
Therefore, approximately 51 moles of sodium chloride are needed.
Calculate the concentration in mol/L, M, of an aqueous sugar solution with a concentration of 5.0% (w/w) and density of 1.000 g/mL at 25°C . The molecular weight of sugar is 342.30 g/mol. Report your answer to three significant figures.
Answers
The concentration of the solution is 0.3 mol/L.
What is the concentration in mole per liter?We know that concentration is the amount of substances that is present. We know that the concentration can be measured by the use of several units and one of the units that we can be able to use is the mol/L.
We have that the concentration in w/w is 5.0% and this means that the mass of water in the solution is 5g. From the density of the solution;
volume = mass/density
= 5g/ 1.000 g/mL
= 5 mL or 0.005 L
Number of moles of sugar = 5g/342.30 g/mol
= 0.015 moles
Concentration = Number of moles/volume
= 0.015 moles/0.005 L
= 0.3 mol/L
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Consider the reaction
2NO(g) + O2(g) = 2NO2(g)
Suppose that at a particular moment during the reaction nitric oxide
(NO) is reacting at the rate of 0.066 M/s. (a) At what rate is NO2
being formed? (b) At what rate is molecular oxygen reacting?
Answers
Answer:
(a) Rate of formation of NO2 is also 0.066M/s
(b) Rate of reaction of O2 gas is 0.033M/s
Explanation:
(a) in one second, according to the equation,
2 moles of NO combines with 2moles of NO2.
Therefore 0.066M NO will still consume 0.066mole NO2.
(b) According to the equation,
2 moles NO consumes 1 mole O2, 0.0666M will consume 0.0333 mole O2
Which one of the following salts, when dissolved in water, produces the solution with a pH closest to 7.00?
Ba O
RbI
Na HSO4
NH4 Cl
Answers
Among all the salt , the one that ionizes to give strongest acid and strongest base, will have pH closest to 7 or neutral. RbI ionize in water to give strongest acid HI and strongest base Rubidium hydroxide.so RbI produces a neutral solution of pH closest to 7.(Option B)
The chemical difference between acids and bases is that acids produce hydrogen ions and bases absorb hydrogen ions. A base is a substance that neutralizes an acid. When bases are added to water, they decompose to form hydroxide ions. This is written OH-. A solution of water with a base added is called an alkaline solution.
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How many magnesium atoms are there in 1.25 mol of magnesium?
Answers
Answer:
1.25 x ( 6.02 × 10^23) = 7.525 × 10^23 atoms
At constant current is passed through an electrolytic cell containing molten MgCl2 for 18 hr. if 4.8 x 105 g of Cl2
are obtained. Calculate the current in Amperes.
Answers
The current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.
To calculate the current in amperes, we need to use Faraday's laws of electrolysis and the stoichiometry of the reaction.
Faraday's laws state that the amount of substance produced or consumed during electrolysis is directly proportional to the quantity of electricity passed through the cell. The relationship is given by:
Q = nF
Where Q is the electric charge in coulombs (C), n is the number of moles of substance involved in the reaction, and F is Faraday's constant, which is equal to 96,485 C/mol.
In this case, the substance being produced is Cl2, and we know the mass of Cl2 produced, which is 4.8 x 10^5 g.
First, we need to calculate the number of moles of Cl2 produced:
Molar mass of Cl2 = 35.45 g/mol
Moles of Cl2 = mass / molar mass = (4.8 x 10^5 g) / (35.45 g/mol) ≈ 1.354 x 10^4 mol
Now we can calculate the quantity of electricity passed through the cell using Faraday's laws:
Q = nF
Q = (\(1.354 x 10^4\)mol) * (96,485 C/mol)
Q ≈ 1.308 x 10^9 C
The quantity of electricity is given in coulombs. To find the current, we need to divide this value by the time in seconds.
Given that the time is 18 hours, we convert it to seconds:
Time = 18 hours * 60 minutes/hour * 60 seconds/minute
Time = 6.48 x 10^4 seconds
Finally, we can calculate the current:
Current (I) = Q / Time
I = (1.308 x 10^9 C) / (6.48 x 10^4 s)
I ≈ 2.02 x 10^4 Amperes
Therefore, the current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.
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Which of these is more likely to be a gas at room temperature?
NaCl
LiO₂
SO₂
Ca₃P₂
Answers
Which of these is more likely to be a gas at room temperature?
The correct answer is C. SO₂Further ExplanationSodium chloride (NaCl), lithium peroxide (LiO₂), and calcium phosphide (Ca₃P₂) are all ionic compounds that have high melting and boiling points due to the strong electrostatic forces of attraction between their ions. At room temperature, NaCl and LiO₂ are solids, and Ca₃P₂ is a grey metallic solid.
In contrast, SO₂ is a molecular compound that consists of molecules made up of one sulfur atom and two oxygen atoms. The electronegativity difference between sulfur and oxygen causes a polar covalent bond between them. SO₂ molecules are held together by weak intermolecular forces of attraction such as van der Waals forces. Thus, SO₂ exists as a gas at room temperature and atmospheric pressure.
What is a gas?- A gas is one of the four fundamental states of matter which is composed of molecules or atoms that are in constant random motion. Gas takes up a larger amount of space than solids or liquids because it has less intermolecular attraction between its particles.
Gases are usually compressible and can fill any container they occupy. The properties of a gas can be explained by the Kinetic Molecular Theory which describes that gas particles are in constant motion, collide with each other and with the walls of the container they are in, and that their motion is random and determined by temperature, pressure and volume.
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What is a temperature?- Temperature is a measure of the degree of hotness or coldness of an object or a substance relative to another. In physics, it is defined as the average kinetic energy of particles (such as atoms, molecules, or ions) in a system. The SI unit of temperature is Kelvin (K), but other common units of temperature include Celsius (°C) and Fahrenheit (°F).
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7. Describe the propert 1 lies of hard and soft materials
Answers
The properties of hard and soft materials refer to their physical characteristics and behaviors.
These properties are related to factors such as the arrangement of molecules, bonding strength, and response to external forces. Here, we will discuss the general properties of hard and soft materials.
Hard materials:
Rigidity: Hard materials exhibit high stiffness and resist deformation under applied forces. They tend to maintain their shape and structure.
High strength: Hard materials have strong intermolecular or intramolecular forces, allowing them to withstand high stress and pressure without breaking or deforming.
High melting and boiling points: Hard materials often have high melting and boiling points due to the strong bonds between their atoms or molecules.
Brittle: Hard materials are often brittle, meaning they have low tolerance to tensile or bending forces and are prone to fracturing or shattering instead of deforming.
Low compressibility: Hard materials have low compressibility, meaning they do not easily compress or change volume under pressure.
Soft materials:
Flexibility: Soft materials are pliable and easily deformable under applied forces. They can be bent, stretched, or compressed without breaking.
Low strength: Soft materials have weak intermolecular or intramolecular forces, making them more susceptible to deformation or damage under stress.
Low melting and boiling points: Soft materials generally have lower melting and boiling points compared to hard materials.
Ductile: Soft materials are often ductile, meaning they can be drawn into thin wires or stretched into thin sheets without fracturing.
High compressibility: Soft materials can be easily compressed or change volume under pressure due to their loosely packed molecular structures.
It's important to note that these properties are generalizations, and there can be variations within each category. Some materials may exhibit properties that fall between hard and soft, or they may have unique combinations of properties. Materials' properties play a crucial role in various applications, as they determine their suitability for specific uses such as construction, manufacturing, and design.
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State whether the following is an example of a physical or chemical change:! 21. Burning a log: ________________________________! 22. Folding a piece of paper: _________________________! 23. Freezing water: _________________________! 24. Bending a copper wire. _________________________!
Answers
Answer:
Physical change
Explanation:
Because it doesn't require any chemical to change
Answer:
Physical change
Physical change
Physical change
Physical change
Explanation:
If 1.00 mol of argon is placed in a 0.500- L container at 24.0 ∘C , what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation)? For argon, a=1.345(L2⋅atm)/mol2 and b=0.03219L/mol .
Express your answer to two significant figures and include the appropriate units.
Answers
The difference between the ideal pressure and the pressure calculated by the Van Der Waal equation is 2.08 atm.
What is the pressure?In this problem, we are mandated to obtain the pressure both by the use of the ideal gas equation and then the use of the Van der Walls equation.
Using the idea gas equation;
PV = nRT
P = nRT/V
P = pressure
V = volume
n = number of moles
T = temperature
R = gas constant
P = 1 * 0.082 * (24 + 273)/0.5
P = 48.7 atm
Using the Van Der Wall equation:
P = RT/(V - b) - a /V^2
P = 0.082 * 297/(0.5 - 0.03219) - 1.345/(0.5)^2
P = 24.354/0.46781 - 1.345/ /0.25
P = 52 - 5.38
P = 46.62 atm
The difference between the ideal pressure and the pressure calculated by the Van Der Waal equation is; 48.7 atm - 46.62 atm = 2.08 atm
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An unknown compound contains 8.92 g sodium,
4.66 g carbon, and 12.42 g oxygen. What is the
empirical formula?.
Answers
Answer:
empirical formula for a compound : ZnO
Further explanation
The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components
The principle of determining empirical formula
Determine the mass ratio of the constituent elements of the compound.
Determine the mole ratio by by dividing the percentage by the atomic mass
Percentage Oxygen :
100\%-80.2%=19.8\%
mol ratio for Zn : O =
How many pounds of 100% gas chlorine are needed to disinfect a flow of 85000gpd at 8mg/l
Answers
One would need approximately 1250.6 pounds of 100% gas chlorine to disinfect a flow of 85000 gallons per day at a concentration of 8 mg/L.
What is chlorine?The chemical element chlorine has the atomic number 17 and the symbol Cl.
The second-lightest halogen, fluorine is situated between bromine and fluorine in the periodic table and has most of its features in the middle.
To calculate the amount of chlorine needed to disinfect a flow of 85000 gallons per day (gpd) at a concentration of 8 mg/L, you can use the following formula:
Mass of chlorine = flow rate x concentration x 8.34
Put in the values:
Mass of chlorine = 85000 * 8 * 8.34
Mass of chlorine = 567200 g
To convert this amount to pounds, divide it by the conversion factor between grams and pounds (453.59):
Mass of chlorine in pounds = 567200 / 453.59
Mass of chlorine in pounds = 1250.6 lb
Thus, 1250.6 pounds of 100% gas chlorine would be required to disinfect an 85000-gallon flow per day at a concentration of 8 mg/L.
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On Earth he weighs 720 newtons. List of weights: 655 N; 1,872 N; 792 N; 36 N; and 661 N. What planets does he visit?
Answers
On Earth he weighs 720 newtons. 36N is the weight. Therefore, the correct option is option D among all the given options.
What is weight?The gravitational force of attraction exerted on an item by the presence of a huge second object, including the Earth or Moon. Weight is a result of the fundamental law of gravitation: whatever two things have the same weight.
They attract each other using a force that really is directly related to the sum of their masses as well as inversely related to the square of something like the distance separating them due to their masses.
F = mass ×4/9g
= 720 ×4/9
=36N
Therefore, the correct option is option D.
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oxidation number of Ag in Ag2O
Answers
The oxidation number of Ag in Ag2O is +1.
In Ag2O, there are two silver atoms (Ag) and one oxygen atom (O). Oxygen is known to have an oxidation number of -2 in most compounds. Since the compound is neutral, the sum of the oxidation numbers of all the atoms must equal zero.
Therefore, the oxidation numbers of the two silver atoms must add up to +2 to balance out the -2 oxidation number of the oxygen atom. Since there are two silver atoms, each silver atom must have an oxidation number of +1 to yield a total oxidation number of +2 for the compound.
In Ag2O, the silver atoms lose one electron each to form Ag+ ions. This results in an oxidation number of +1 for each silver atom. The oxygen atom gains two electrons from the silver atoms to achieve a stable octet configuration, resulting in an oxidation number of -2 for the oxygen atom. The compound Ag2O is formed through the transfer of electrons, with each silver atom exhibiting an oxidation number of +1.
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