Practice question

Given: For the reaction 1/2H₂(g) + 1/2Cl₂(g) -> HCl(g), if Δ_f H° of HCl(g) is -92.32 kJ/mol, what is Δ_r H? These values define the system as per NCERT data. Formula: Δ_r H = [-92.32] - [0 + 0] = -92.32 kJ/mol.. This is standard NCERT relation. Substitution & Calculation: Substituting values and simplifying step by step as per NCERT method. Result: The computed value matches expected outcome and confirms correct choice as per NCERT.