4.0 g of a gas occupies 22.4 liters at NTP. The specific heat capacity of the gas at constant volume is 5.0 $JK^{−1}$ $mol^{−1}$. If the speed of sound in this gas at NTP is 952 $ms^{−1}$, then the heat capacity at constant pressure is (Take gas constant R = 8.3 $JK^{−1}$ $mol^{−1}$)