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Thermostoichiometry: Calculating Heat of Reaction

CHEM-AKG1NC

Consider the following reaction:

$$2\ {C}_{2}{H}_{6} + 7\ {O}_{2} \rightarrow 4\ C{O}_{2} + 6\ {H}_{2}O; \Delta{H}_{rxn} = -3120\ kJ$$

Calculate ${q}_{rxn}$ if $0.5\ mol$ of ${C}_{2}{H}_{6}$ reacts in excess ${O}_{2}$.

A

$-3120\ kJ$

B

$-1560\ kJ$

C

$-780\ kJ$

D

$-446\ kJ$