One mole of an ideal diatomic gas undergoes undergoes a

One mole of an ideal diatomic gas undergoes undergoes a transition from A to B along a path AB as shown in the figure.

The change in internal energy of the gas during the transition is:

Change in internal energy from A → B

∆U =	f	nR∆T =	f	nR (T_f – T_i)	5	{P_fV_f – P_iV_i}
	2		2		2

(As gas is diatomic ∴ f = 5)

=	5	{2 × 10³ × 6 – 5 × 10³ × 4}
	2

=	5	{12 - 20} × 10³J = 5 × (-4) × 10³J
	2

∆U = - 20KJ