Practice question

Given: For the reaction N₂O(g) + 1/2O₂(g) -> 2NO(g), if Δ H = 99.25 kJ/mol at 298 K, what is Δ U (R = 8.314 J/mol · K)? Formula: Δ n_g = 2 - (1 + 0.5) = 0.5, RT = 2.48 kJ. Substitution & Calculation: Δ H = Δ U + Δ n_g RT. Δ U = 99.25 - 0.5 × 2.48 = 98.01 kJ/mol. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.