(Solved): A sample of solid biphenyl weighing 0.5260g was ignited in a bomb calorimeter initially at 25 ...

A sample of solid biphenyl weighing $0.5260\mathrm{g}$ was ignited in a bomb calorimeter initially at $25^{?}\mathrm{C}$, producing a temperature rise of $1.910\mathrm{K}$. Assuming a constant volume, calculate the $?\mathrm{H}$ of combustion of biphenyl. To properly determine the standard enthalpy of combustion for the solid biphenyl, the calorimeter was first calibrated. A $0.8250\mathrm{g}$ sample of benzoic acid $\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COOH},\mathrm{MW}122.1\mathrm{g}/\mathrm{mol}\right))$ was ignited under identical conditions and produced a temperature rise of $1.940\mathrm{K}$. For benzoic acid, the internal energy combustion at constant volume, $?\mathrm{U}$, is known to be $?3226\mathrm{kJ}/\mathrm{mol}$. Calculate the calorimeter constant, in $\mathrm{kJ}/\mathrm{K}$.