Determine the mass of water that can be heated from 15 to 60 degrees by spending

Determine the mass of water that can be heated from 15 to 60 degrees by spending for this the amount of heat equal to 945 kJ.

The amount of heat spent on heating water:

Q = C * m * (tк – tн), where Q is the consumed amount of heat (Q = 945 kJ = 945 * 10 ^ 3 J), C is the specific heat capacity of water (C = 4200 J / (kg * K)), m – the required mass of water (kg), tк – the final water temperature (tк = 60 ºС), tн – the initial water temperature (tн = 15 ºС).

Heated water mass:

m = Q / (С * (tк – tн)) = 945 * 10 ^ 3 / (4200 * (60 – 15)) = 5 kg.

Answer: By spending 945 kJ of heat, you can heat 5 kg of water.