Question: how much heat energy is needed to change 10 kg of ice?
Answer: The quantity of heat needed to raise the temperature of ice from - 30°C to 0°C i.e. sensible heat, Q1 = mc(t2 - t1 ) = 10 kg × 2100 J/(kg°C) × (0 - - 30)°C = (10 × 2100 × 30) J = 630 kJ The quantity of heat needed to melt 10 kg of ice at 0°C, i.e. the latent heat, Q 2 = mL = 10 kg × 335 kJ/kg = 3350 kJ Total heat ...