Question

An experiment is carried on a fixed amount of gas at different temperatures and at high pressure such that it deviates from the ideal gas behaviour. The variation of $\frac{PV}{RT}$ with P is shown in the diagram. The correct variation will correspond to

• A. (a) Curve A
• B. Curve B
• C. Curve C
• D. Curve D

Answer 1

Answer: (B)

Curve B

Answer 2

(DQ)_{V = const.} = m C_v dT

= 2 × $\frac{3R}{2}$ × (– 150) ...(1)

(DQ)_{P = const.} = 2 × $\frac{5R}{2}$× 150 ...(2)

Total heat absorbed

Q = (DQ)_{P= const.} + (DQ)_{V = const.}

= (750 – 450) 8.3 = 300 × 8.3 = 830 × 3

= 2490 J = 2500 J