Question

A cylinder of fixed capacity of 44.8 litres contains helium gas at standard temperature and pressure. The amount of heat needed to raise the temperature of gas in the cylinder by 20.0°C will be (Given gas constant R = 8.3 JK–1-mol–1)

• A. 249 J
• B. 415 J
• C. 498 J
• D. 830 J

Answer 1

Answer: (C)

498 J

Answer 2

The correct option is(C): 498 J.

Δ Q = _nC v_Δ T (Isochoric process)

$=2×\frac{3R}{2}×20$

= 498 J