What standard reaction enthalpy is obtained if the hydrogenation reaction

C $2$ H $2+2$ H $2->$ C $2$ H $6$ is carried out at $75\backslash$deg C$.$ The associated average molar heats are:

Cp $($H$2)=28\mathrm{.}97$ J$/$K mol $,$

Cp $($C $2$ H $2)=47\mathrm{.}35$ J$/$K mol $,$

Cp $($C $2$ H $6)=56\mathrm{.}48$ J$/$K mol $.$

The $\backslash$Delta R H $(298$ K$)$ value is $310\mathrm{.}2$ kJ$/$ mol $.$