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Enthalpy Change

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AP Chemistry

Definition

Enthalpy change refers to the amount of heat absorbed or released by a system at constant pressure during a chemical reaction.

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Practice Questions (11)

Given the following data about gold: ∆Hfus = 13.2 kJ/mol, ∆Hvap = 310.9 kJ/mol, what would be the enthalpy change when gold transitions from a liquid to a solid phase?
The enthalpy change of a reaction is typically measured at:
Which of the following statements is true about the enthalpy change of a reaction?
The enthalpy change for a reaction can be determined experimentally using:
Given the following data: 2S (s) + 3O₂ (g) -> 2SO₃ (g), ΔH=-790 kJ. The enthalpy change accompanying the reaction of 1 mole of S is:
Given the following data: 2S (s) + 3O₂ (g) -> 2SO₃ (g), ΔH=-790 kJ. What is the enthalpy change for the reaction S (s) + 3/2O₂ (g) -> SO₃ (g)?
If the enthalpy change of a reaction is -200 kJ, which of the following is true?
Which of the following is true about the enthalpy change of a reaction?
If the enthalpy change of a reaction is negative, which of the following is true?
The enthalpy change for the reaction H2(g) + F2(g) → 2HF(g) is -538 kJ/mol. If the enthalpy change for the reaction H2(g) → 2H(g) is 436 kJ/mol and the enthalpy change for the reaction F2(g) → 2F(g) is 155 kJ/mol, what is the enthalpy change for the reaction 2H(g) + 2F(g) → 2HF(g)?
What is the enthalpy change for the reaction: C2H2(g) + 5/2O2(g) → 2CO2(g) + H2O(g) given the following chemical equations: (1) C2H2(g) + 5/2O2(g) → 2CO(g) + H2O(g) ΔH = -636.1 kJ/mol; (2) CO(g) + 1/2O2(g) → CO2(g) ΔH = -283.0 kJ/mol; (3) C2H2(g) + 5/2O2(g) → 2CO2(g) + H2O(g) ΔH = -1299.5 kJ/mol?

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