The complete combustion of ethene at 298 K is given by

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

\text{C}_2\text{H}_4(g) + 3\,\text{O}_2(g) \rightarrow 2\,\text{CO}_2(g) + 2\,\text{H}_2\text{O}(l)

. Standard enthalpies of formation are

\Delta H_f^{\circ}(\text{C}_2\text{H}_4) = +52.3\,\text{kJ mol}^{-1}

\Delta H_f^{\circ}(\text{CO}_2) = -393.5\,\text{kJ mol}^{-1}

, and

\Delta H_f^{\circ}(\text{H}_2\text{O},l) = -285.8\,\text{kJ mol}^{-1}

(oxygen gas is zero). Determine the standard enthalpy change per gram of

\text{CO}_2

produced, reporting your answer in kJ g

^{-1}