Question

If C_p and C_v are the specific heats for a gas at constant pressure and at constant volume respectively, then the relation C_p - C_v = R is exact for

(a) ideal gas and nearly true for real gases at high pressure

(b) ideal and real gases at all pressures

(c) ideal gas and nearly true for real gases at moderate pressure

(d) ideal gas at all pressure and real gas at moderate pressure

Answer 1

Correct option (c) ideal gas and nearly true for real gases at moderate pressure

Explanation :

C_p - C_v = R is exact for ideal gas. It is nearly true for real gases at moderate pressure.