What is the change in internal energy of gas? — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

ΔU = n × $C_v$ × ΔT. For $H_2$, $C_v$ = 2.5R. n = 4, ΔT = -50 K, R = 2 cal/K-mol: ΔU = 4 × 2.5 × 2 × (-50) = -1000 cal.