What amount of heat is released during the transformation of 500 g of water taken at 20 ° C

What amount of heat is released during the transformation of 500 g of water taken at 20 ° C into ice at a temperature of 0 ° C?

Task data: m (mass of water) = 500 g (0.5 kg); t (water temperature before cooling) = 20 ºС; t0 (temperature of the formed ice) = 0 ºС; heat losses during the process are not taken into account.

Reference values: C (specific heat capacity of the formed water) = 4200 J / (kg * K); λ (specific heat of crystallization of water) = 34 * 10 ^ 4 J / kg.

Calculation formula: Q = C * m * (t – t0) + λ * m.

Calculation: Q = 4200 * 0.5 * (20- 0) + 34 * 10 ^ 4 * 0.5 = 212,000 J (212 kJ).

Answer: 212 kJ of heat is released.