Moles Ratio: Calculate Heat Generated by N2 & H2

In summary, a mole ratio is the ratio of the number of moles of one substance to the number of moles of another substance in a balanced chemical equation. To calculate a mole ratio, one must balance the chemical equation and determine the number of moles of each substance involved. The mole ratio is important in chemical reactions because it allows for accurate prediction of product formation and reactant consumption. To calculate the heat generated by N2 and H2, one must know the mole ratio and use the heat of reaction. The mole ratio can be affected by factors such as stoichiometry, reactant purity, and side reactions or impurities. Accurate measurement and balancing of reactants is crucial for determining the correct mole ratio.
  • #1
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Homework Statement



Given:

(1/2) mol N2 + (3/2) mol H2 -> NH3 change in H = -46.11 kJ/mol

If the number of moles of N2 are changed to 10 and the number of moles of H2 to 35,
how much heat is generated if only 10% of the Nitrogen reacts?


The Attempt at a Solution



After setting up a ratio, I find that 10 moles of N2 can produce 20 moles of NH3. Thus, 10% of the N2 means 10% of the NH3, so 2 moles of NH3 are produced.

I multiple 2 by the original energy to achieve -92.22kJ.

Did I do this correctly?
 
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  • #2
Appears to be correct.
 

What is a mole ratio?

A mole ratio is the ratio of the number of moles of one substance to the number of moles of another substance in a balanced chemical equation.

How do you calculate a mole ratio?

To calculate a mole ratio, you need to balance the chemical equation and then determine the number of moles of each substance involved. Then, divide the moles of one substance by the moles of the other substance to get the mole ratio.

Why is the mole ratio important in chemical reactions?

The mole ratio is important because it tells us the relative amounts of substances that are involved in a chemical reaction. This allows us to accurately predict the amount of product that will be formed and the amount of reactant that will be consumed.

How do you use mole ratio to calculate heat generated by N2 and H2?

To calculate the heat generated by N2 and H2, you need to know the mole ratio of these two substances in the chemical reaction. Then, you can use the heat of reaction (or enthalpy change) for the reaction and the mole ratio to calculate the heat generated by N2 and H2.

What factors can affect the mole ratio in a chemical reaction?

The mole ratio in a chemical reaction can be affected by several factors, including the stoichiometry of the reaction, the purity of the reactants, and any side reactions or impurities that may be present. It is important to accurately measure and balance the reactants in order to determine the correct mole ratio.

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