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AP Chemistry Flashcards: Enthalpy Of Formation

Study Enthalpy Of Formation in AP Chemistry with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

What is the standard enthalpy of formation for oxygen gas, O2(g)O_2(g)?

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ANSWER

0 kJ/mol. Diatomic oxygen is an element in its standard state.

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This deck focuses on Enthalpy Of Formation, giving you a quick way to review the definitions, rules, and examples that matter most for AP Chemistry.

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Practice questions

1 of 45Practice questions for this set
Use the standard enthalpies of formation, ΔHf∘\Delta H_f^\circ, to calculate ΔHrxn∘\Delta H_{\text{rxn}}^\circ for the reaction at 298 K:\n\nH2(g)+Cl2(g)→2HCl(g)\text{H}_2(g) + \text{Cl}_2(g) \rightarrow 2\text{HCl}(g)\n\nFormation data (kJ/mol): ΔHf∘[H2(g)]=0\Delta H_f^\circ[\text{H}_2(g)] = 0, ΔHf∘[Cl2(g)]=0\Delta H_f^\circ[\text{Cl}_2(g)] = 0, ΔHf∘[HCl(g)]=−92\Delta H_f^\circ[\text{HCl}(g)] = -92.
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