The decomposition of ammonia proceeds according to the equation with per mole of…

CHEMISTRY · Single correct · AP · Chemistry · Thermochemistry · Thermochemistry

Problem

The decomposition of ammonia proceeds according to the equation 2 NH3(g)→N2(g)+3 H2(g)2\,\text{NH}_{3}(g) \rightarrow \text{N}_{2}(g)+3\,\text{H}_{2}(g) with ΔHrxn=+92 kJ\Delta H_{\text{rxn}} = +92\,\text{kJ} per mole of reaction as written. What quantity of heat is absorbed at constant pressure when 0.40 mol0.40\,\text{mol} of NH3\text{NH}_{3} decomposes? (a) 36.8 kJ36.8\,\text{kJ} absorbed (b) 18.4 kJ18.4\,\text{kJ} released (c) 18.4 kJ18.4\,\text{kJ} absorbed (d) 46 kJ46\,\text{kJ} absorbed

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