JEE Main 2026 · 2 Apr · Shift 2 · Physics Q48

← JEE Main 2026 · 2 Apr · Shift 2

PhysicsInteger+4 / -1Question 48 of 75

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 $c_p=8$ cal/mol.°C and $R=8.36$ J/mol.°C. The change in the internal energy of the gas is ________ calorie.

Your answer

Answer and worked solution

Official answer: 300

Heat capacity at constant volume. $R=\frac{8.36}{4.18}=2$ cal/mol °C, so $c_v=c_p-R=6$ cal/mol °C.

Internal energy. $\Delta U=nc_v\Delta T=5\times6\times10=300$ cal.

Answer: 300

Topics:First law and internal energy Specific heats of gases

← Previous question Next question →

JEE Main 2026 · 2 Apr · Shift 2, Physics question 48