Here, 5.70 grams of hydrogen (H2) are produced from 50.7 g of aluminum (Al) in the reaction.
To find the grams of hydrogen (H2) produced from 50.7 g of aluminum (Al) in the reaction:
2Al + 3H2SO4 → 3H2 + Al2(SO4)3
First, find the molar mass of Al and H2:
Al: 26.98 g/mol
H2: 2.02 g/mol
Next, convert the given mass of Al (50.7 g) to moles:
50.7 g Al * (1 mol Al / 26.98 g Al) = 1.88 mol Al
Now, use the stoichiometry of the balanced equation to find the moles of H2 produced:
1.88 mol Al * (3 mol H2 / 2 mol Al) = 2.82 mol H2
Finally, convert the moles of H2 to grams:
2.82 mol H2 * (2.02 g H2 / 1 mol H2) = 5.70 g H2
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An experiment requires a solution of 60 % ethanol by volume. What volume of alcohol should be added to make a 200 mL of this solution?
Answer: 120 mL of ethanol must be added.
Explanation:
We are given:
60% ethanol by volume
This means that 60 mL of ethanol is present in 100 mL of solution
Given volume of solution = 200 mL
Applying unitary method:
If 100 mL of solution contains 60 mL of ethanol
So, 200 mL of solution will contain = \(\frac{60}{100}\times 200=120mL\) of ethanol
Hence, 120 mL of ethanol must be added.
intermolecular forces are the interactions between molecules and are generally weaker than bonds within molecules. what types of intermolecular forces are found in ch2cl2?
CH2Cl2 has both dipole-dipole interactions and London dispersion forces as its intermolecular forces.
In CH2Cl2 (dichloromethane), the types of intermolecular forces present are:
1. Dipole-dipole interactions: These occur between polar molecules, like CH2Cl2, which have a positive and a negative end (dipole). In CH2Cl2, the electronegative chlorine atoms pull electron density away from the carbon and hydrogen atoms, creating a dipole moment.
2. London dispersion forces: These are temporary, weak attractive forces that occur between all molecules, including nonpolar ones. They arise due to random fluctuations in the electron distribution, leading to temporary dipoles.
In summary, CH2Cl2 has both dipole-dipole interactions and London dispersion forces as its intermolecular forces. These forces are generally weaker than the covalent bonds within the CH2Cl2 molecules themselves.
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water may exist in food products in a variety of different forms. which one of these forms of water would have physicochemical properties (such as melting point, boiling point, and density) most different from those of bulk water? (select one answer)
a. Physically bound water b. Chemically bound water c. Capillary water d. Bulk water
The form of water that would have physicochemical properties most different from those of bulk water is "chemically bound water." The correct answer is b.
Explanation:
Water is present in food products in various forms. The different forms of water include bulk water, physically bound water, chemically bound water, and capillary water. Bulk water refers to the water present in the spaces between food components.
Physically bound water refers to the water that is held in foods by weak physical forces such as hydrogen bonds, while capillary water is water that is present in small pores and is held by surface tension forces. The form of water that has the most different physicochemical properties from bulk water is chemically bound water.
Chemically bound water is water that is bound to the food matrix through chemical bonds such as covalent, ionic, or hydrogen bonds. It has physicochemical properties that are different from those of bulk water due to its strong bonding with the food matrix. For instance, it has a higher melting point, boiling point, and density than bulk water.
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Describe in your own words, why a balloon, after it has been rubbed on a sweater, floats back towards the sweater when released.
Your answer must contain electric force, attract, electrons, and protons.
Explanation:
By rubbing the balloon on a sweater, you can transfer negative charges onto the surface of the balloon
Are the following chemical equations reversible or irreversible?
2H2O ←→ H3O+ + OH-
HA + H2O ←→ A- + H3O+
HA + H2O → A- + H3O+
MOH → M+ + OH-
The first two chemical equations are reversible while the other two are irreversible.
What are chemical equations?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Identify the stronger acid in each pair.
A. HCN or H3O+
HCN
H3O+
They are the same in acidic properties.
B. H2SO4 or HCN
H2SO4
HCN
They are the same in acidic properties.
C. HS? or H2S
HS?
H2S
They are the same in acidic properties.
A. In this pair, H3O+ is the stronger acid because it can donate a proton more easily than HCN.
B. H2SO4 is the stronger acid in this pair because it is a strong acid, while HCN is a weak acid.
C. HS? is the stronger acid in this pair because it has a greater positive charge on the sulfur atom, making it more acidic than H2S.
The stronger acid in each pair.
A. Between HCN and H3O+, the stronger acid is H3O+. H3O+ is a stronger acid due to its higher ability to donate a proton.
B. Between H2SO4 and HCN, the stronger acid is H2SO4. H2SO4 is a stronger acid because it has a higher degree of ionization and can donate more protons than HCN.
C. Between HS- and H2S, the stronger acid is H2S. H2S is a stronger acid because it more readily donates a proton compared to HS-.
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How many total electrons must be transferred to form one formula unit of Al2O3?
To form one formula unit of Al2O3, a total of 12 electrons (6 from aluminum and 6 from oxygen) must be transferred.
The compound Al2O3, commonly known as aluminum oxide, is formed when two aluminum atoms and three oxygen atoms bond. To determine the number of total electrons that must be transferred to form one formula unit of Al2O3, we first need to find the number of electrons that are present in one formula unit of Al2O3.
Aluminum has an atomic number of 13, which means it has 13 protons and 13 electrons in a neutral atom. Each aluminum atom in Al2O3 contributes 3 electrons, and since there are two aluminum atoms in one formula unit of Al2O3, the total number of electrons contributed by aluminum atoms is 6.
Oxygen has an atomic number of 8, which means it has 8 protons and 8 electrons in a neutral atom. Each oxygen atom in Al2O3 contributes 2 electrons, and since there are three oxygen atoms in one formula unit of Al2O3, the total number of electrons contributed by oxygen atoms is 6.
Therefore, to form one formula unit of Al2O3, a total of 12 electrons (6 from aluminum and 6 from oxygen) must be transferred.
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how does sublimation occur and why does it not pass through the liquid phase?
Answer:
Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase. ... This is because the pressure of their triple point is very high and it is difficult to obtain them as liquids.
Is air a mixture or pure substance
Answer:
pure substance
Explanation:
Describe an experiment to determine the density of a liquid
Answer:
Take the measuring cylinder and measure its mass, in grams, as accurately as possible. Take the measuring cylinder off the balance and add the water carefully. Put the measuring cylinder back on the balance. Measure and record the new mass . Repeat the procedure, recording the volume and total mass, until the measuring cylinder is full. Then, for each volume calculate the mass of the liquid alone.Repeat steps 1 to 3 Draw a graph of mass of liquid against volume . Calculate the density of each liquid from the gradient of its graph line.
Explanation:
what is the physical state of element chromium
Answer:
Solid metal.
Explanation:
At room temperature, Chromium (Cr), a transition metal, is a solid.
A teacher has given a lab student a white chemical sample and asks her to confirm that it contains 7. 03 x 1023 formula units of sodium hydroxide
(NaOH). Using the balance in the laboratory, what mass of NaOH would the student have to find to verify that her teacher was correct? Round your
answer to 3 significant figures.
( ? grams)
The NaOH given to the student should weigh 46.3 grams.
The formula units can be calculated as moles multiplied by the Avogadro number.
Avogadro number is, 6.023 × 10^23.
The formula units are given to be 7.03 × 10^23.
Formula units = Avogadro Number × Number of moles
7.03 × 10^23 = 6.023 × 10^23 × Number of moles
Number of moles = (7.03 × 10^23)/(6.033 × 10^23)
Number of moles = 1.16
One mole of NaOH has the mass 39.99 grams.
1.16 moles of NaOH has mass = 1.16 × 39.99 grams.
= 46.38 grams.
Hence, the NaOH should weigh 46.3 grams.
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a student mixes 31.0 ml of 3.06 m pb(no3)2(aq) with 20.0 ml of 0.00187 m na2so4(aq) . how many moles of pbso4(s) precipitate from the resulting solution? the sp of pbso4(s) is 2.5×10−8 .
The number of moles of PbSO₄(s) precipitated from the resulting solution would be 0.0141 moles.
A precipitation reaction will take place in which the Na₂SO₄(aq) and Pb(NO₃)₂(aq) will react and form PbSO₄(s) solid and NaNO₃(aq).
This is the balanced chemical reaction that takes place:Na₂SO₄(aq) + Pb(NO₃)₂(aq) → PbSO₄(s) + 2NaNO₃(aq)
We first need to determine the number of moles of Na₂SO₄(aq) that is available:0.0200 L × 0.00187 mol/L = 3.74 × 10⁻⁵ mol Na₂SO₄(aq)
Since the reaction has a 1:1 molar ratio between Na₂SO₄(aq) and PbSO₄(s), the number of moles of PbSO₄(s) that will form will be the same.
Therefore, 3.74 × 10⁻⁵ mol PbSO₄(s) will form.In order to calculate the mass of PbSO₄(s) that will precipitate out, we can use the formula:m = n × MM
where m = mass in grams, n = number of moles, and MM = molar mass of PbSO₄The molar mass of PbSO₄ is:1 Pb + 1 S + 4 O = 207.2 g/molSo, mass of PbSO₄(s) = 0.00775 g
We can use the solubility product constant (Ksp) to determine if all of the PbSO₄(s) will precipitate out.Ksp = [Pb²⁺][SO₄²⁻] = 2.5 × 10⁻⁸[Pb²⁺] = [SO₄²⁻] = xMoles of Pb²⁺ and SO₄²⁻ = 0.0141 mol
The molarity of PbSO₄(s) is thus:0.0141 mol ÷ 0.051 L = 0.276 M
This is greater than the Ksp of 2.5 × 10⁻⁸, so not all of the PbSO₄(s) will precipitate out.
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in an ideal form, action research is a ______ in which the researcher is actively engaged with those experiencing the problem versus conducting research on them
In an ideal form, action research is a collaborative process in which the researcher is actively engaged with those experiencing the problem, rather than conducting research on them.
Action research is an approach that involves actively working with individuals or communities to identify and address problems or challenges they face. It emphasizes collaboration, participation, and empowerment. The researcher, in this case, acts as a facilitator, working alongside the individuals or communities to co-create knowledge, implement interventions, and evaluate the outcomes. The goal of action research is not solely to gather information or conduct research on the participants, but rather to involve them as active partners in the research process. The researcher and the participants collaborate to understand the problem, develop solutions, and make meaningful changes that address the issue at hand. This approach aims to foster mutual learning, engagement, and transformation for all involved parties.
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Which phrase best describes the particles in a solid?
a. sliding around
b. very far apart
c. closely packed
d.completely still
Answer:
C
The particles in solid are closely packed which prevent it from changing its shape
The phrase that best describes the particles in a solid is closely packed.
SOLIDS:
Matter is any substance that has mass and occupies space. It can exist in three states namely: solid, liquid and gas.Solids as a state of matter contains particles that are closely packed together and hence, appear compact in shape. The force of attraction that holds the particles of a solid together are firm. Therefore, phrase that best describes the particles in a solid is closely packed.Learn more at: https://brainly.com/question/17061172?referrer=searchResults
when an atom gains an electron it becomes a cation true or false
Answer: False
Explanation: Gaining an electron which has a negative charge results in an overall negative charge, thus making this an anion, and the answer, false.
Answer:false
Explanation:it becomes a anion
Which event typically causes upwelling? (10 Points)
A. Wind blows warm water away from the shore.
B. Warm water rises to the surface of the ocean.
C. Neap tides move cold water away from the shore.
D. Cold waterfalls to the bottom of the ocean and pushes warm water up.
Answer:
A
Explanation:
Conditions are optimal for upwelling along the coast when winds blow along the shore. Winds blowing across the ocean surface push water away. Water then rises up from beneath the surface to replace the water that was pushed away. This process is known as “upwelling.”
3. How does the wave change if the volume increases?
Answer:
When you increase the volume of the tone, you are adding energy to the sound wave, resulting in larger vibrations
Explanation:
Who was the second person to organize the elements on the periodic table and what property did he use to re-organize them?
Answer:
Dmitri Mendeleev
Explanation:
He was a Russian Scientist who decided to reorganize the periodic table after other notable scientists such as Antoine-Laurent Lavoisier had also tried to organize it based on the states of matter of the elements.
Mendeleev reorganized the period in the order of increasing atomic mass although there were some other modifications by modern scientists.
Suppose the interaction between two atoms by the Lennard-Jones potential: ULJ = B/r^12 - A / r^6 where the values of A and B are known to be A = 10^-77 J x m^6 and B = 10^-134 J x m^12.
What does the Lennard-Jones potential predict for the separation r=r eq
hen the energy is at the minimum (equilibrium) value, U min. What is the u min fot this interaction at T=298 K ? What is the ratio of U min to the purely attractive van der Waals component of the interaction potential at r eq.
What is the ratio of r eq to r 0 defined by u(r 0 )=0. 4. What is the ratio of r s to r 0 , where r s is the separation where the magnitude of the (attractive adhesion) force is maximum, F max . What is the value for F max between the two atoms?
a) The Lennard-Jones potential predicts the separation r_eq at the minimum energy U_min.
b) The U_min for this interaction at T=298 K is the value obtained from the Lennard-Jones potential equation when r=r_eq.
c) The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the attractive part (-A/r^6) to the total potential energy U_min.
d) The ratio of r_eq to r_0, where u(r_0)=0.4, can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.
e) The ratio of r_s to r_0, where r_s is the separation where the magnitude of the attractive adhesion force is maximum, can be determined by finding the value of r where the derivative of the potential energy with respect to r is equal to zero.
f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the potential energy equation with respect to r and evaluating it at r=r_s.
a) The Lennard-Jones potential provides information about the relationship between energy and separation between two interacting atoms.
At the minimum energy (U_min), the potential predicts the separation r_eq, which corresponds to the equilibrium distance between the atoms. This is the distance at which the energy of the system is at its lowest point.
b) To determine the value of U_min at a given temperature (T=298 K), you can substitute the equilibrium separation r_eq into the Lennard-Jones potential equation and calculate the resulting energy value.
This will give you the U_min for the interaction.
c) The Lennard-Jones potential consists of two components: an attractive component (-A/r^6) and a repulsive component (B/r^12).
The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the magnitude of the attractive component to the total potential energy at the equilibrium separation.
This ratio provides insights into the relative contribution of the attractive force to the overall potential energy at equilibrium.
d) The ratio of r_eq to r_0 can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.
In other words, you need to solve the Lennard-Jones potential equation for r_eq when the potential energy is equal to 0.4 times the potential energy at r=r_0.
e) The ratio of r_s to r_0 is obtained by finding the value of r where the magnitude of the attractive adhesion force is maximum.
This can be determined by finding the separation r where the derivative of the potential energy equation with respect to r is equal to zero.
The value of r_s represents the separation at which the attractive force between the atoms is strongest.
f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the Lennard-Jones potential energy equation with respect to r and evaluating it at r=r_s.
This will give you the magnitude of the maximum attractive adhesion force between the atoms.
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Based on the information shown, which of the following explains why the pressure in tank X is greater than that in tank Y ?
Tank X tank y
Ar(g) N2(g)
p=150atm p=130atm
v=70L v=70L
T=21 c T=21c
The pressure in tank X is greater than that in tank Y because the number of moles or mass of argon gas in Tank X is greater than the number of moles or mass of nitrogen gas in Tank Y.
What is the pressure of a gas?The pressure of a gas is the force that molecules of the gas exert per unit area of the walls of their container due the collisions of the gas molecules with themselves and with the walls of their contain.
The pressure of a gas is related to the volume (V), temperature (T) and number of moles (n) of the gas by the formula:
P = nRT/Vwhere;
R is molar gas constantn = mass/Molar mass.Since volume, temperature and R is constant for the two gases, the pressure difference will be determined by the number of moles of each gas.
Number of moles of a gas is proportional to the mass of the gas present.
Therefore, the best explanation as to why the pressure in tank X is greater than that in tank Y is that the number of moles or mass of argon gas in Tank X is greater than the number of moles or mass of nitrogen gas in Tank Y.
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in a laboratory, you determine that the density of a certain solid is 5.23×10−6kg/mm3. Convert this density into kilograms per cubic meters.
Answer:
5.23×10⁺⁹ kg/m³
Explanation:
Given data:
Density of solid = 5.23×10⁻⁶ Kg/mm³
Density of solid in Kg/m³
Solution:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
Symbol:
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density
In order to covert Kg/mm³ into Kg/m³ we will divide the value by 10⁺⁹ because 1 m³ = 1000000000 mm³
5.23×10⁻⁶ Kg/mm³ / 10⁺⁹
5.23×10⁺⁹ kg/m³
What happens to an acid or a base when it is diluted with water?
Answer:
Adding water to an acid or base will change its pH. Water is mostly water molecules so adding water to an acid or base reduces the concentration of ions in the solution. When an acidic solution is diluted with water the concentration of H+ ions decreases and the pH of the solution increases towards 7. To make the pH change by 1, a tenfold dilution is required (eg adding 9 cm3 of water to 1 cm3 acid). The acid is becoming less acidic. Similarly, when an alkali is diluted with water the concentration of OH- ions decreases. This causes the pH of the alkali to fall towards 7, making the solution less alkaline as more water is added.
Explanation:
A genetic mutation that causes abnormal cells to rapidly reproduce and divide often leads to .
Answer:
Cancer
Explanation:
Cancer is a genetic disease—that is, it is caused by changes to genes that control the way our cells function, especially how they grow and divide. Genetic changes that cause cancer can happen because: of errors that occur as cells divide.
What is the bond order of N2+? Express the bond order numerically. Is N2+ paramagnetic or diamagnetic? paramagnetic diamagnetic neither
Bond order of N2+ is 2.5. It is a diamagnetic substance.
Bond order is termed as the number of chemical bonds between a pair of the atoms. For example: In case of acetylene the bond order between the two carbon atoms is 3, in diatomic nitrogen the bond order is 3, and the C-H bond order is 1.
The bond order of N2+ is 2.5.
Bond order = 1 / 2[Nb - Na] Where, Nb = no. of electrons in bonding molecular orbital and Na = number of electrons in antibonding molecular orbital.
Bond order = 9-4 / 2
= 2.5
N2+ is diamagnetic in nature because they do not have any unpaired electrons they are having 14 electrons.
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(a) State Dalton's Law of Additive Pressure. (b) A room contains moist air comprising of 0.3 moles of oxygen, 0.6 moles of nitrogen and 0.1 moles of water vapor at room temperature (25°
C) and pressure (1 atm). Given that the specific enthalpy of air at 25°
C is 298.18 kJ/kg, determine the following: i. Total number of moles of moist air in the room
ii. Specific enthalpy of the oxygen
iii. Specific enthalpy of the nitrogen
iv. Specific enthalpy of the water vapor
Dalton's Law of Additive Pressure states that in a mixture of gases, the total pressure exerted by the mixture is equal to the sum of the partial pressures of each individual gas component.
What is the relationship between the total pressure and partial pressures of gases in a mixture?Dalton's Law of Additive Pressure states that in a mixture of gases, the total pressure exerted by the mixture is equal to the sum of the partial pressures of each individual gas component.
In the given scenario, the room contains moist air composed of 0.3 moles of oxygen, 0.6 moles of nitrogen, and 0.1 moles of water vapor at room temperature and pressure.
To determine the specific enthalpy of each component, we need to consider the properties of the gases.
i. The total number of moles of moist air in the room can be calculated by summing the moles of each component: 0.3 + 0.6 + 0.1 = 1 mole.
ii. The specific enthalpy of oxygen can be determined by multiplying the moles of oxygen (0.3) by the specific enthalpy of air at 25°C (298.18 kJ/kg). This gives us the specific enthalpy of oxygen.
iii. Similarly, the specific enthalpy of nitrogen can be obtained by multiplying the moles of nitrogen (0.6) by the specific enthalpy of air.
iv. The specific enthalpy of water vapor can be calculated by multiplying the moles of water vapor (0.1) by the specific enthalpy of air.
By performing these calculations, we can determine the specific enthalpies of each component of the moist air mixture.
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An organic compound was analyzed and found to contain 70. 6% carbon, 5. 9% hydrogen, and 23. 5% oxygen by mass. Additionally, the molar mass of the compound was experimentally determined to be 136 g/mole. What is the molecular formula for the compound? how many grams of mgcl 2 would be required to prepare 250 ml of a 0. 8 m solution of that solute in water? please report your answer to two digits after the decimal place.
The correct answer is C8H8O2.
What is organic compound?Organic combinations are a substance that contains covalently- bonded carbon and hydrogen and often with other ingredients. Organic compounds examples are benzoic Acid, aromatic mixtures, benzoic aldehyde, propanoic acid, butanoic acid, malonic acid, amines, heterocyclic compounds, VOC, benzoic acid, and diethyl malonate.organic compound, any of a large class of chemical combinations in which one or more atoms of carbon are covalently linked to atoms of other elements, most generally hydrogen, oxygen, or nitrogen. The few carbon-containing combinations not categorized as organic comprise carbides, carbonates, and cyanides.Organic compounds important to human functioning include carbohydrates, lipids, proteins, and nucleotides. These mixtures are said to be organic because they include both carbon and hydrogen.To learn more about organic compound, refer to:
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Mass in grams 1mole of Cu
What is the period number of krypton
The period number of krypton is 4
Answer:
The period number for Krypton is 4.
Explanation:
Krypton (Kr), is a chemical element, a rare gas of Group 18 (noble gases) of the periodic table, which forms relatively few chemical compounds.
The addition polymer that has the formula shown below is used in surgical sutures, dishwasher-safe food containers, thermal underwear, and many other products.
⎛⎝HH||−C−C−||HCH3⎞⎠n
Draw one monomer unit. Show all hydrogen atoms
H
|
H--C=C--H C H
|
H
This is one monomer unit of polypropylene, which is a thermoplastic polymer used in various applications such as surgical sutures, dishwasher-safe food containers, thermal underwear, and many other products.
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