The quantity of heat Q that changes the temperature T of a mass m of a substance

Question

The quantity of heat Q that changes the temperature T of a mass m of a substance is given by Q = mcT, where c is the specific heat capacity of the substance. For example, for H20, c = 1 cal/g°C. And for a change of phase the quantity of heat Q that changes the phase of a mass m is Q = mL, where L is the heat of fusion or heat of vaporization of the substance. For example, for H20 the heat of fusion is 80 cal/g or 80 kcal/kg, and the heat of vaporization is 540 cal/g or 540 kcal/kg. Use these relationships to determine the number of calories to change(a) 1.2 kg of 0°C ice to 1.2 kg 0°C ice water Enter a number. 1 kcal (b) 1.2 kg of 0°C ice water to 1.2 kg 100°C boiling water Enter a number. 2 kcal (c) 1.2 kg of 100°C boiling water to 1.2 kg l00°C steam Enter a number. 3 kcal (d) 1.2 kg of 0°C ice to 1.2 kg 100°C steam Enter a number. 4 kcal

Explanation / Answer

Just the last one?

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   1.2 kg ice at 0 to 1.2 kg of steam at100

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heat to melt ice + heat to warm water + heat to vaporize water

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