The ratio of specific heats of a gas is 1.4 and the value of specific heat at constant pressure is 7.0 cal/mole°C. The difference between specific heat at constant pressure and specific heat at constant volume will be (in cal/mole°C)
- A. 1.4
- B. 1.7
- C. 5.0
- D. 2.0
Answer: D. 2.0
Explanation: $\gamma = C_p/C_v = 1.4$. Given $C_p = 7.0$. $C_v = 7.0/1.4 = 5.0$. Difference $C_p - C_v = 2.0$.