Acetic acid $($CH$\_(3)($C$)/($O$)$O H$)$ is cracked to produce the intermediate ketene $($CH$\_(2)$CO$($g$))$ in a furnace. CH$\_(3)($C$)/($O$)$O H$($g$)->$CH$\_(2)$CO$($g$)+$H$\_(2)$O$($g$),\_($l$),\backslash$Delta HR$(298$K$)=132$k$($J$)/($m$)$ol The following side reaction also occurs to an appreciable extent. CH$\_(3)($C$)/($O$)$O H$($g$)->$CH$\_(4)($g$)+$CO$\_(2)($g$),\_(2),\backslash$Delta H$\_($R$)(298$K$)=-33\mathrm{.}53$k$($J$)/($m$)$ol A conversion of acetic acid is $80$