4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at constant volume is 5.0 J K-1mol⁻¹. If the speed of sound in this gas at NTP is 952 m/s, then the heat capacity at constant pressure is (Take gas constant R = 8.3 J K-1 mol⁻¹)
(a) 7.0 J K⁻¹mol⁻¹
(b) 8.5 J K⁻¹mol⁻¹
(c) 8.0 J K⁻¹mol⁻¹
(d) 7.5 J K⁻¹mol⁻¹
