JEE Main 2026 Physics question
5 moles of unknown gas is heated at constant volume from 10°C to 20°C. The molar specific heat of this gas at constant pressure = 8 cal/mol.°C and R = 8.36 J/mol.°C. The change in the internal energy of the gas is calorie.
Answer: 300
Solution
R ≈ 8.36/4.18 ≈ 2 cal/mol°C, so = − R = 6 cal/mol°C. ΔU = ΔT = 5 × 6 × 10 = 300 cal.