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1) What experimental condition is required for the heat change in a reaction to be numerically equal to the enthalpy change (ΔH)?


2) When 1 mol of nitrogen gas reacts with 3 mol of hydrogen gas, 2 mol of ammonia gas is produced and 92.6 kJ of heat is released. Write the thermochemical equation.

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Answer:

Answers are in the explanation

Explanation:

1) The constant pressure is necessary during a reaction. Thus, the heat released in the reaction will be = ΔH

2) The reaction described in the problem is:

1 N₂(g) + 3H₂(g) → 2NH₃(g)

The thermochemical equation involves the change in heat, as 92.6kJ are released, the heat must be wrote as another reactant, that is:

N₂(g) + 3H₂(g) → 2NH₃(g) + 92.6kJ