Practice question

Given: Calculate the heat required to raise the temperature of 28 g of ethanol from 30°C to 50°C (specific heat of ethanol = 2.46 J/g · K). Formula: q = m × c × Δ T. Substitution & Calculation: m = 28 g, c = 2.46 J/g · K, Δ T = 50 - 30 = 20 K. q = 28 × 2.46 × 20 = 1377.6 J = 1.38 kJ. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.