dT = 20 degrees Celsius – the temperature at which the water was heated;
Q = 5 kJ = 5000 Joules – the amount of heat spent on heating water;
c = 4200 J / (kg * C) – specific heat of water.
It is required to determine m (kilogram) – the mass of heated water.
m = Q / (c * dT) = 5000 / (4200 * 20) = 5000/84000 = 0.06 kilograms = 60 grams.
Answer: with the help of 5 kJ of heat, you can heat water with a mass of 60 grams.
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