Practice question

Given: What is the heat released when 44 g of propane (C₃H₈) burns completely? (Δ H° = -2219.85 kJ/mol, molar mass = 44 g/mol) These values define the system as per NCERT data. Formula: Moles = 44 / 44 = 1 mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Heat = 1 × 2219.85 = 2219.85 kJ. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.