Chemistry

Problem

Propane combusts according to the equation

\mathrm{C_3H_8(g)} + 5\,\mathrm{O_2(g)} \rightarrow 3\,\mathrm{CO_2(g)} + 4\,\mathrm{H_2O(l)};\; \Delta H^\circ = -2.22 \times 10^{3}\,\text{kJ}

per mole of propane. If

15.0\,\text{g}

of propane are burned completely at standard conditions, what is the enthalpy change for the process? a)

-2.22 \times 10^{3}\,\text{kJ}

+7.55 \times 10^{2}\,\text{kJ}

-7.55 \times 10^{2}\,\text{kJ}

-1.11 \times 10^{3}\,\text{kJ}