What mass of water can be heated by 10 ° C if 1 kJ is consumed? (Sv = 4200J / kg × ° С)

Task data: Δt (required change in water temperature) = 10 ºС; Q (the amount of consumed thermal energy) = 1 kJ (1 * 10 ^ 3 J).
Reference values: according to the condition Sv (specific heat capacity of water) = 4200 J / (kg * ºС).
We express the mass of water that can be heated at the expense of 1 kJ of thermal energy from the formula: Q = Cw * m * Δt and m = Q / (Cw * Δt).
Calculation: m = 1 * 10 ^ 3 / (4200 * 10) = 0.0238 kg (23.8 g).
Answer: 23.8 grams of water can be heated at 10 ºС.