The enthalpy of formation of ammonia gas is P -46. \( \mathrm{kJ} /...

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The enthalpy of formation of ammonia gas is
P -46. \( \mathrm{kJ} / \mathrm{mol} \). The enthalpy change for the

W reaction \( 2 \mathrm{NH}_{3}(\mathrm{~g}) \rightarrow \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \) is
(1) \( 46.0 \mathrm{~kJ} \)
(2) \( 92.0 \mathrm{~kJ} \)
(3) \( 23.0 \mathrm{~kJ} \)
(4) \( -92.0 \mathrm{~kJ} \)
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