Practice question

Given: What is the heat released when 13.5 g of ethanol burns completely? (Δ H° = -1367 kJ/mol, molar mass of C₂H₅OH = 46 g/mol) These values define the system as per NCERT data. Formula: Moles = 13.5 / 46 = 0.2935 mol. This is standard NCERT relation. Substitution & Calculation: Heat = 0.2935 × 1367 = 401.2 kJ. Result: The computed value matches expected outcome and confirms correct choice as per NCERT.