Chemistry

Problem

The decomposition of ammonia proceeds according to the equation

2\,\text{NH}_{3}(g) \rightarrow \text{N}_{2}(g)+3\,\text{H}_{2}(g)

with

\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\,\text{mol}

\text{NH}_{3}

decomposes? a)

36.8\,\text{kJ}

absorbed b)

18.4\,\text{kJ}

released c)

18.4\,\text{kJ}

absorbed d)

46\,\text{kJ}

absorbed