Calculate the heat capacity of a gas sample from the following information: The sample comes to equilibrium in a flask at $25C$ and $121\mathrm{.}3$kPa. A stopcock is opened briefly, allowing the pressure to drop to $101\mathrm{.}3$kPa. With the stopcock closed, the flask warms, returning to $25C,$ and the pressure is measured as $104\mathrm{.}0$kPa. Determine $CP$ in $J*mol-1*K-1$ assuming the gas to be ideal and the expansion of the gas remaining in the flask to be reversible and adiabatic.