Question

In Mayer's relation, $C_P-C_V=R$

'R' stands for

• A. translational kinetic energy of 1 mol gas
• B. rotational kinetic energy of 1 mol gas
• C. vibrational kinetic energy of 1 mol gas
• D. work done to increase the temperature of 1 mol gas by one degree

Answer 1

Answer: (D)

PV = RT (For 1 mol) …(i)

$P\left(V+\Delta V\right)=R\left(T+1\right)$ …(ii)

From equation (i) and (ii),

$P\Delta V=R$

i.e., W = R (work done).