Use the Following Data to Determine the Standard Enthalpy of Reaction

Multiple Choice

Use the following data to determine the standard enthalpy of reaction at 298 K for the addition of hydrogen chloride, HCl, to ethene, C₂H₄
C₂H₄(g) + HCl(g) ? C₂H₅Cl(g)
$\begin{array}{lc}& \Delta \$ \mathrm{H}^{\circ}(298 \mathrm{~K}) / \mathrm{kJ} \mathrm{mol}^{-1} \\\mathrm{C}_{2} \mathrm{H}_{4} \\& +52.2 \\\mathrm{HCl} \\& -92.3 \\\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Cl} \\ & -109.8\end{array}$

A) -34.7 kJ mol^-1
B) 149.9 kJ mol^-1
C) -69.7 kJ mol^-1
D) 254.3 kJ mol^-1