Chapter 9, Problem 9.55PAE

9.55 Hydrogen gas will react with either acetylene or ethylene gas. The thermochemical equations for these reactions are provided below. Write the thermochemical equation for the conversion of acetylene into ethylene by hydrogen gas.

   ${\text{C}}_{\text{2}}{\text{H}}_{\text{2}}\left(\text{g}\right)+{\text{2H}}_{\text{2}}\left(\text{g}\right)\to {\text{C}}_{\text{2}}{\text{H}}_{\text{6}}$

   $\Delta \text{H}°$= -311 kJ

   ${\text{C}}_{\text{2}}{\text{H}}_{\text{4}}\left(\text{g}\right)+{\text{H}}_{\text{2}}\left(\text{g}\right)\to {\text{C}}_{\text{2}}{\text{H}}_{\text{6}}$

   $\Delta \text{H}°$ = -136 kJ