Question

If C_P and C_V denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then
(a) C_P – C_V = 28R 

(b) C_P –  V = R/28

(c) C_P – C_V = R/14 

(d) C_P – C_V = R

Answer 1

(b) : Molar heat capacity = Molar mass × specific heat capacity
So, the molar heat capacities at constant pressure and constant volume will be 28C_P and 28C_V respectively

Therefore, 28C_P – 28C_V = R or C_P - C_V = R/28.