ρ-V diagram of a diatomic gas is a straight line passing through origin. The molar heat capacity of the gas in the process will be

ρ-V diagram of the gas is a straight line passing throughorigin. Hence,  p∝V or ρV-1 = constantMolar heat capacity in the process ρVX = constant isC=Rγ−1+R1−xHere, γ = 1.4 (For diatomic gas) and x = -1⇒ C=R1.4−1+R1+1⇒C=3R