21.47 g of ethane is needed to provide the heat . To calculate the grams of ethanol needed to provide 575 kJ of heat, the mass of ethanol used can be calculated using the following formula.
Mass of ethanol = (heat of combustion/heat of combustion per gram of ethanol) * volume of gasohol
The combustion of ethanol generates 1234 kJ of energy per mole. Therefore, the heat of combustion of ethanol can be calculated as follows:
Heat of combustion = (1234 kJ/mol)(1 mol)
Heat of combustion = 1234 kJ/mol
Now, the heat of combustion per gram of ethanol can be determined by dividing the heat of combustion by the molar mass of ethanol.
Heat of combustion per gram of ethanol = Heat of combustion/molar mass of ethanol
Heat of combustion per gram of ethanol = (1234 kJ/mol)/(46.07 g/mol)
Heat of combustion per gram of ethanol = 26.77 kJ/g
To calculate the mass of ethanol required to provide 575 kJ of heat, the following formula can be used:
Mass of ethanol = (heat of combustion/heat of combustion per gram of ethanol) * volume of gasohol
Mass of ethanol = (575 kJ/26.77 kJ/g) * 1 L
Mass of ethanol = 21.47 g
Therefore, 21.47 g of ethanol is needed to provide 575 kJ of heat.
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If 3.5 L of a 4.5 M SrCl2 solution is diluted to 40 L , what is the molarity of the diluted solution
Given,Initial volume of solution (V1) = 3.5 L, Initial molarity of solution (M1) = 4.5 MDiluted volume of solution (V2) = 40 L and the molarity of the diluted solution is 0.39375 M.
using the formula of molarity,
M1V1 = M2V2
Substituting the given values, we get
4.5 × 3.5 = M2 × 40
M2 = (4.5 × 3.5)/40
M2 = 0.39375 M
We are given that the initial volume of solution is 3.5 L and its initial molarity is 4.5 M. The diluted volume of the solution is 40 L, and we are asked to find the molarity of the diluted solution. We can use the formula of molarity to solve the problem, which is M1V1 = M2V2, where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.
Therefore, we can conclude that the molarity of the diluted solution is 0.39375 M.
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Which of the following is an example of a chemical change?
A
separating water into different glasses
B
breaking frozen ice cubes with a hammer
с
running an electric current through water
D
boiling water to evaporate it on a stove
Answer:
C
Explanation:
Answer:
D
Explanation:
Chemical change is the changing of a substance using fire or heat to either evaporate or stir the mix together, so its D
Suppose you carry out a titration involving 3.00 molar HCl and an unknown concentration of KOH. To bring the reaction to its end point, you add 35.3 milliliters of HCl to 105.0 milliliters of KOH. What is the concentration of the KOH solution?
Answer: The concentration of the KOH solution is 1.01 M
Explanation:
According to neutralization law:
\(n_1M_1V_1=n_2M_2V_2\)
where,
\(n_1\) = basicity of \(HCl\) = 1
\(n_2\) = acidity of KOH = 1
\(M_1\) = concentration of HCl = 3.00 M
\(M_2\) = concentration of KOH = ?
\(V_1\) = volume of HCl = 35.3 ml
\(V_2\) = volume of KOH = 105.0 ml
Putting the values we get:
\(1\times 3.00\times 35.3=1\times M_2\times 105.0\)
\(M_2=1.01\)
Thus the concentration of the KOH solution is 1.01 M
2H2O(g) -- 2H2(g) + O2(g)
What total volume of gas (at STP) is produced by the electrolysis of 4 moles of H2O?
Explanation:
\(v = vdm \times n\)
Vdm=22.4dm.
mole(n)=4 mol
therefore the total volume
\(v = 22.4 \times 4 \\ v = 89.6dm\)
1. Carry out the following mathematical operation, and give each reult with the correct number
of ignificant figure. (1pt)
A. 1. 05 x 10-3
/6. 135
B. 21 - 13. 8
The answer of the mathematical operation to the correct number of significant figures is 1.71x10⁻⁴
The answer of the mathematical operation to the correct number of significant figures is 7.2
The no of significant figures in the answer depends on the no of significant figures in the problem given.
It is given 1.05x10⁻³/6.135 , so the number of significant figures in 1.05x10⁻³ is 3 and in 6.135 is 4. So the answer of this operation will be rounded off to have 3 significant figures only. Since the calculated amount comes out as 0.17114x10⁻³. But it has to be rounded to 4 significant figures. So the answer will be 1.71x10⁻⁴
It is given 21-13.8 , so the number of significant figures in the operation are 2 and 3 respectively. So the calculated amount comes to be 7.2 and it already has 2 significant figures.
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How many atoms of silver metal (Ag) are required to
react completely with 531.8 g of iodine (I2) to produce
silver iodide (AgI)?
This question is asking for the number of atoms of silver metal that are required to react completely with 531.8 g of iodine to produce silver iodide. At the end, the result turns out to be 2.524x10²⁴ atoms:
What is stoichiometry?In chemistry, stoichiometry is a tool for us to perform mole-mass-particles relationships in chemical reactions. Thus, these problems require a balanced chemical equation, molar masses and the Avogadro's number to proceed.
In such a way. we start by writing the balanced equation for this problem:
\(2Ag+I_2\rightarrow 2AgI\)
Hence, we can calculate the atoms of silver with the following stoichiometric setup:
\(531.8gI_2*\frac{1molI_2}{253.81gI_2}*\frac{2molAg}{1molI_2} *\frac{6.022x10^{23}atomsAg}{1molAg}\)
Where 253.81 is the molar mass of diatomic iodine, 2:1 the mole ratio of silver to iodine and 6.022x10²³ the Avogadro's number. Thus, after solving, we obtain:
\(2.524x10^{24}atomsAg\)
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If you are given a piece of rock sugar about 2.5 cm in diameter, describe three steps you can take to dissolve it in a beaker of water in the shortest time.
Answer:
1. Crush the sugar into powder.
2. Heat the water.
3. Dissolve it by stirring continuously
Explanation:
1. Crushing the sugar into powder increases surface area. So it increases the changes of dissolving
2. Heating the water increases the capacity of water to dissolve sugar.
3. Stirring continuously increases randomness of particles so eases mixing up thus increasing dissolving tendency.
5. Solve the following crossword puzzle.
a. Maximum energy generation in India is done using ........ energy.
b. energy is a renewablesource of
energy.
c.Solar energy can be called.... energy.
e. ......... energy of water in dams is used for generation of electricity.
Answer:
I think it is b
Explanation:
What is the molarity of a solution with a volume of 2.3 Liters and 9.7 moles?
Answer:
Explanation:
molarity = (moles of solute)/(liters of solution) = 9.7/2.3 = 4.2
How can being a mentor help the next generation of chemist?
The mentors will assist the chemist fellows in choosing themes that are appropriate for both the development of the Burg fellow and the undergraduate students' learning experience.
What is a mentor's function? How could a mentor assist you with your research?The mentor's ultimate objective is to make the trainee an autonomous researcher. Sharing expertise and abilities, supervising the trainee's work, assisting the trainee in connecting with other researchers, and providing career counselling are all aspects of mentoring.
What should mentors concentrate on to aid in the learning outcomes of their mentees?Be mentee-focused and build your relationship based on the mentee's particular learning objectives. To assist the development of your mentee, give them unbiased comments and concentrate on their specific actions and behaviours.
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What is the Anion and it’s charge.
Answer:
anion has a negative charge
An anion has more electrons than protons, consequently giving it a net negative charge
The individual markings on the metric side of your ruler are blank apart. When measuring the length of the object is placed as close as possible to blank. The other end of the object will be somewhat between two of the markings, which allows one to measure the length to the nearest blank of a blank.
How are prepare Tolu Balsam syrup by percolation?
Tolu Balsam syrup prepared by percolation is commonly used as an expectorant and cough syrup.
Tolu Balsam syrup can be prepared by percolation as follows:
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Use exponential notation to express the number 12,500 to
1 significant figure:
2 significant figures:
3 significant figures:
1
2
5
Explanation:
start from the left tor right
If your sample of vinegar is approximately 4.76% (w/w), what volume should you use so that approximately 40 mL of 0.1 M NaOH is required to neutralize your sample of vinegar
Based on the concentrations given, the volume of vinegar required is 5.04 mL.
What is the concentration of the vinegar solution?The concentration of a solution is the amount of solute in a given volume of solution.
Concentration can be expressed as:
molar concentration percentage concentrationThe concentration of the vinegar solution is 4.76% (w/w). This means that 4.76 g of vinegar is present in 100 g of solution.
Mass of vinegar = 4.76 g
molar mass if vinegar = 60 g/mol
moles of vinegar = 4.76/60 = 0.0793 moles
volume of solution/water = 100 mL or 0.1 L
Molarity of vinegar = 0.0793/0.1 = 0.793 M
1 mole of vinegar reacts with 1 mole of NaOH
let the volume of vinegar required be V
0.793 M × V = 40 × 0.1
V = 4/0.793
V = 5.04 mL
Therefore, the volume of vinegar require is 5.04 mL.
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What is the compound N₂O3 called?
Answer:
Explanation:
Dinitrogen trioxide is a nitrogen oxide. Nitrogen trioxide appears as a blue liquid with a sharp, unpleasant chemical odor.
Description: Dinitrogen trioxide is a nitrogen oxide.ChEBINitrogen trioxide appears as ...
Synonyms: Dinitrogen trioxideNITROGEN TRIOXIDENitrogen oxide (N2O3)10544-7...
Molecular Formula: N2O3
Molecular Weight: 76.012 g/mol
Answer:
It is called Dinitrogen trioxide. Hope this helps!
3. Two substances, both liquids, start at the same temperature. You transfer
the same amount of energy out of both liquids, but substance 1 becomes a
solid before substance 2. Which substalice has a stronger molecular
attraction?
A Substance 1
B Substance 2
Pleas help I will give you Brainlyest
Answer:
Substance 1
Explanation:
Because if it becomes a solid BEFORE the other it means that the structure is more sound than the other substance. and if you add heat to something that becomes a solid it means it will come closer
I Hope this helps <3 and again i don't need the crown
group 12 metal that was once used in thermometers, but is now known to be poisonous
Formerly employed in thermometers, mercury is a group 12 metal that is now recognized as toxic.
How come zinc is in Group 12?Only +2 ions (M +2 ions) with the configuration (n — 1)d 10 are formed by them. These are not true transition elements since the elements or ions they produce have fully filled (n — 1)d orbitals. They are, nevertheless, grouped with transition metals after forming their own group.
What did thermometers use in place of mercury?Examples of thermometers without mercury include liquid-in-glass thermometers and electronic digital thermometers. The platinum resistance thermometer is an illustration of an electronic digital thermometer. The thermistor and the thermocouple are more examples.
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Which feature is shared by all three-carbon monosaccharides?
The features are shared by all three-carbon monosaccharides, They are all pentoses. In their linear forms, they all contain carbon carboxyl and several hydroxyl functional groups. In their linear forms, they all contain a carbonyl and several hydroxyl functional groups.
Carbon is used in some form in almost every industry in the world. It is used as fuel in the form of coal, methane gas, and crude oil (used to make gasoline). It is used to make all sorts of materials, including plastics and alloys such as steel (a combination of carbon and iron).
Life on Earth cannot exist without carbon. This allows carbon to readily form bonds with other atoms, giving it flexibility in the forms and functions that biomolecules such as DNA and RNA can adopt, and is essential for growth and replication, the defining properties of life. This is partly due to
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Which of the following is an example of an element? a water b air c sugar d oxygen
Answer:
d. Oxygen
Explanation:
- Water is not an element but a compound made of hydrogen and oxygen elements
- Air is a compound made of gases such as oxygen, nitrogen, rare gases and carbondioxide...
- Sugar is an organic compound (sucrose) made of carbonyl carbons and hydrocarbons
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Which of the following is a characteristic of both eukaryotic and prokaryotes cell?
A. Ribosomes and Cell Membrane
B. Nucleus
C.Membrane bound organelles
D.Simple
which of the following best describes what a scientist does
This might help you with your question.
This is a person who scientific researches to make more knowledge in a certain area of interest
Write the chemical equation for combustion of Propane.
Propane, also known as C₃H₈, is a flammable hydrocarbon gas used primarily as a fuel for heating, cooking, and engine fuel in vehicles. The chemical equation for the combustion of propane is:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
This equation can be read as "propane reacts with oxygen to produce carbon dioxide and water." During combustion, the heat energy is produced by breaking the chemical bonds between the carbon and hydrogen atoms in propane, and the oxygen in the air. This reaction releases large amounts of energy in the form of heat and light.
The balanced chemical equation shows that one molecule of propane reacts with five molecules of oxygen to form three molecules of carbon dioxide and four molecules of water. This reaction releases a large amount of energy in the form of heat and light, which is why propane is commonly used as a fuel source for heating and cooking.
In summary, the chemical equation for the combustion of propane is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. This equation shows that propane reacts with oxygen to produce carbon dioxide and water, while releasing a large amount of energy in the form of heat and light.
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Can you store cuso4 in an aluminum container? explain your reasoning
We can store the copper sulphate solution in alumiun container, if cover on alumiun is present.
Can you store cuso4 in an aluminum container?Aluminium is more reactive than copper so the Aluminium will displace copper sulphate from its solution by reacting with it but if there is cover on the aluminium then the alumium can't react with copper.
So we can store the copper sulphate solution in alumiun container.
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No, we cannot store CuSO₄ in an aluminum container because aluminum will displace the copper present in the solution.
Why do different chemicals require different containers?Different chemicals are put in different containers, usually glass, plastic, dark container, or light container.
Chemicals element are reactive to different substances and to each other.
That's why they are put in separate and different types of containers according to their reactivity.
Thus, No, we cannot store CuSO₄ in an aluminum container because aluminum will displace the copper present in the solution.
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Given the following value, is the starting material or product lower in energy? Select the single best answer. Delta G degree = -37 kJ/mol A. starting material B. product
The answer is product.
The free energy of a thermodynamic system is referred to as the Gibbs free energy or Gibbs energy. The Gibbs free energy is a thermodynamic quantity that represents the thermodynamic system's ability to do reversible work.The formula for Gibbs energy is shown below:
ΔG = ΔH - TΔS
where:ΔG: the Gibbs free energy of the system
ΔH: the enthalpy of the systemT: the temperature of the system
ΔS: the entropy of the system
The Gibbs free energy can be calculated using the following formula:
ΔG° = - RT lnK
where:ΔG°: the Gibbs free energy at standard state
R: the gas constant
T: the temperature in kelvins
K: the equilibrium constant
The value of ΔG° determines the direction in which a chemical reaction will proceed. A negative ΔG° means that the reaction is spontaneous, while a positive ΔG° means that the reaction is non-spontaneous.
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What do the digestive system and skeletal system have in common?
Answer:
Answer:Your skeletal system relies on the nutrients it gains from your digestive system to bulid strong healthy bones .A body system is a group of parts that work together to serve a common purpose .
maybe this might be ur answer
A Wisconsin gardener notes that the plants immediately bordering a walkway are stunted compared with those farther away. Suspecting that the soil near the walkway may be contaminated from salt added to the walkway in winter, the gardener tests the soil. The composition of the soil near the walkway is identical to that farther away except that it contains an additional 50 mM NaCl. Assuming that the NaCl is completely ionized, calculate how much it will lower the solute potential of the soil at 20∘C using the solute potential equation:
Ψs = -iCRT
where i is the ionization constant(2 for NaCl), C is the molar concentration(In mol/L, R is the pressure constant[R - 0.00831(L.MPa)/(mol.k), and T is the temperature in Kelvin(273 + oC). How would this change in the solute potential of the soil affect the water potential of the soil? In what way would the change in the water potential of the soil affect the movement of water in or out of the roots?
The additional 50 mM NaCl in the soil near the walkway will lower the solute potential of the soil at 20°C.
To calculate the change in solute potential, we can use the solute potential equation: Ψs = -iCRT. In this case, i is the ionization constant (2 for NaCl), C is the molar concentration of NaCl (50 mM or 0.05 M), R is the pressure constant, and T is the temperature in Kelvin (293 K).
Substituting the values into the equation, we have:
Ψs = -2 * 0.05 * 0.00831 * 293 = -24.38 MPa
Therefore, the addition of 50 mM NaCl will lower the solute potential of the soil near the walkway by 24.38 MPa.
This change in solute potential will affect the water potential of the soil. Water potential is the sum of solute potential (Ψs) and pressure potential (Ψp). Since solute potential is negative, a decrease in solute potential will lead to a decrease in water potential. As the solute potential becomes more negative, the water potential of the soil decreases.
The change in water potential of the soil near the walkway will affect the movement of water in and out of the roots. Water moves from an area of higher water potential to an area of lower water potential. In this case, since the water potential of the soil near the walkway has decreased, water will tend to move out of the roots and into the soil, resulting in a decreased water uptake by the plants.
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Acorbic acid or Vitamin C (C6H8O6) i an eential vitamin. It cannot be tored by the body and mut be preent in the diet. What i the molar ma of Vitamin C? Vitamin C are taken a a dietary upplement. If a typical tablet contain 500mg of Vitamin C what amount (mole) and what number of molecule of Vitamin C doe it contain?
The molar mass of ascorbic acid (C₆H₈O₆) is 176 g/mol. The 0.028 mol (amount ) of Vitamin C tablet contains 1.37 × 10 ²² molecules.
The ratio between the mass and the amount of substance in any sample of a chemical compound is known as the molar mass in chemistry. The molar mass of a substance is a bulk attribute rather than a molecular one.
Molar mass of the ascorbic acid is equal to the sum of the average masses of its constituents -
Molar mass of ascorbic acid (C₆H₈O₆)is -
⇒ 6 × 12 + 8 × 1 + 6 × 16
⇒ 72 + 8 + 96
⇒ 176 g/mol
Mass of 1 Vitamin C tablet is 500mg,
Mass of Vitamin C in 10 Tablets = 0.5 g × 10 = 5 g
Moles of Vitamin C in 10 tablets -
= 5 × (1 mol / 176) = 0.028 mol
Number of molecules = 0.028 mol ×[ 6.022 × 10²³ / 1 mol ]
⇒ 0.137 × 10 ²³ molecules. 0r 1.37 × 10 ²² molecules
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Which of the following is a homogeneous mixture? a) Ice cubes in soda c) Sandy water b) Vinegar d) Silver
Answer:
The answer is salty water
Explanation:
Hope this helps :)
How many grams of NH3 form when 22g H2 react completely?
The Answer to the question is 124.66 grams approximately.
It is given that H₂ will react completely
Molar mass of H₂ = 2 × 1 = 2 gm/mol
Given mass of H₂ = 22 gm
Moles of H₂ reacting = given mass of H₂ / molar mass of H₂
Moles of H₂ reacting = 22 / 2 moles = 11 moles
So, 11 moles of H₂ are taking part in reaction.
The Balanced chemical reaction is as follows as:
N₂ + 3 H₂ → 2 NH₃
It is clear from the reaction that 3 moles of H₂ are making 2 mole of NH₃
3 moles of H₂ → 2 mole of NH₃
1 moles of H₂ → 2/3 mole of NH₃
11 moles of H₂ → (2/3)×11 mole of NH₃
11 moles of H₂ → 22/3 mole of NH₃
So, 11 moles of H₂ will make 22/3 mole of NH₃
22/3 mole NH₃ = mass formed NH₃ / molar mass of NH₃
mass formed NH₃ = 22/3 × molar mass of NH₃
mass formed NH₃ = 22/3 × 17
mass formed NH₃ = 22/3 × 17
mass formed NH₃ = 124.66 grams (approximately)
124.66 grams of NH₃ will be formed.
So, approximately 124.66 grams of NH₃ is formed from 22 grams of H₂.
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