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AP®︎/College Chemistry

Course: AP®︎/College Chemistry > Unit 6

Lesson 7: Enthalpy of formation

Enthalpy of formation

\ce{OF2}(g) + \ce{H2O}(g) \rightarrow \ce{O2}(g) + \ce{2HF}(g)

The standard enthalpy change for the reaction represented above is delta, H, start subscript, 1, end subscript. The standard enthalpies of formation for

\ce{H2O}(g)

and

\ce{HF}(g)

are delta, H, start subscript, 2, end subscript and delta, H, start subscript, 3, end subscript, respectively.

Which of the following expressions is equivalent to the standard enthalpy of formation for $\ce{OF2}(g)$ ?

(Choice A)
delta, H, start subscript, 3, end subscript, minus, delta, H, start subscript, 2, end subscript, minus, delta, H, start subscript, 1, end subscript
(Choice B)
delta, H, start subscript, 3, end subscript, minus, delta, H, start subscript, 2, end subscript, plus, delta, H, start subscript, 1, end subscript
(Choice C)
2, delta, H, start subscript, 3, end subscript, minus, delta, H, start subscript, 2, end subscript, minus, delta, H, start subscript, 1, end subscript
(Choice D)
2, delta, H, start subscript, 3, end subscript, minus, delta, H, start subscript, 2, end subscript, plus, delta, H, start subscript, 1, end subscript

[AP Chemistry equations and constants]

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AP®︎/College Chemistry

Course: AP®︎/College Chemistry > Unit 6

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