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AP® Chemistry

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Moderate

Net Energy Change Description

APCHEM-YE1NIC

Based on the following enthalpy diagram for a forward reaction from elements to products, the total change in enthalpy for the reverse reaction from products to elements is best described by which of the following?

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A

$ΔH_{rxn}= ΔH_1+ ΔH_2+ ΔH_3$

B

$ΔH_{rxn}= ΔH_1- ΔH_2- ΔH_3$

C

$ΔH_{rxn}= -ΔH_1+ ΔH_2+ ΔH_3$

D

$ΔH_{rxn}= ΔH_2+ ΔH_3$