$4.0 \mathrm{~g}$ of a gas occupies $22.4$ liters at NTP. The specific heat capacity of the gas at constant volume is $5.0 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$. If the speed of sound in this gas at NTP is $952 \mathrm{~ms}^{-1}$, then the heat capacity at constant pressure is (Take gas constant $\mathrm{R}=8.3 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$ ) (1) $8.5 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$ (2) $8.0 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$ (3) $7.5 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$ (4) $7.0 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$