N2 (g) + 3H2 (g) → 2NH3(g) ΔH = -92.2 kJ

How much heat (in kJ) is released if 13.3 g of hydrogen is consumed to make ammonia?
(Give your answer as a positive number, since you cannot release negative energy.)

To find the amount of heat released, we can use the stoichiometry of the reaction and the given value of ΔH.

1. Calculate the moles of H2 used:
Given mass of H2 = 13.3 g
Molar mass of H2 = 2 g/mol
Moles of H2 = (13.3 g) / (2 g/mol) = 6.65 mol

2. Use the stoichiometry of the reaction to determine the moles of NH3 produced:
From the balanced equation, the stoichiometric ratio between H2 and NH3 is 3:2.
Moles of NH3 = (6.65 mol H2) × (2 mol NH3 / 3 mol H2) = 4.43 mol NH3

3. Calculate the amount of heat released using the molar enthalpy change given:
ΔH = -92.2 kJ/mol
Heat released = (4.43 mol NH3) × (-92.2 kJ/mol) = -407.646 kJ

Since heat energy cannot be negative, the amount of heat released is 407.646 kJ.

To calculate the heat released in this reaction, we need to use the given equation and the molar mass of hydrogen. Here's how you can find the answer step by step:

1. Determine the molar mass of hydrogen (H2). Hydrogen has an atomic mass of approximately 1 g/mol, so the molar mass of H2 is 2 g/mol.

2. Calculate the number of moles of hydrogen (H2) consumed in the reaction. To do this, divide the given mass (13.3 g) by the molar mass (2 g/mol):
moles of H2 = mass / molar mass
= 13.3 g / 2 g/mol
= 6.65 mol

3. Use the stoichiometry of the reaction to determine the moles of NH3 produced. According to the balanced equation, 3 moles of H2 react to form 2 moles of NH3. So, the ratio is 2 moles NH3 / 3 moles H2.

moles of NH3 = (moles of H2) * (2 moles NH3 / 3 moles H2)
= 6.65 mol * (2 mol NH3 / 3 mol H2)
= 4.43 mol

4. Now, we can calculate the heat released using the equation:
heat released = moles of NH3 * ΔH
= 4.43 mol * -92.2 kJ/mol
= -408.126 kJ

Since we are asked to give the answer as a positive number, we can ignore the negative sign. Therefore, the heat released when 13.3 g of hydrogen is consumed to make ammonia is approximately 408.126 kJ.

6 g H2 releases 92.2 kJ so

92.2 x 13.3/6 = ? kJ.