The heat of reaction for, 

${\mathrm{C}}_{10}{\mathrm{H}}_8\left(\mathrm{s}\right)+12{\mathrm{O}}_2\left(\mathrm{g}\right)\to 10{\mathrm{CO}}_2\left(\mathrm{g}\right)+4{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$, at constant volume is -122.2 k cal at 25°C. Calculate the heat of reaction at constant pressure at 25°C.