Question

If the heat of formation of HCl is 92.5 kcal, what is the heat of formation of 73 g HCl?

Options

• 92.5 kcal

• 185 kcal

• 46.3 kcal

• 135 kcal

Answer 1

185 kcal

Explanation:

Heat of formation is the amount of heat absorbed or evolved during the formation of 1 mole of a substance. Therefore,

1 mol HCI = 92.5 kcal

∴ 36.5 g HCl = 92.5 kcal

∴ 73 g HCl = 185 kcal