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 ΔT of a mass m of a substance is given by Q = cmΔT, 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 H2O, 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 kg of 0°C ice to 0°C ice water,
(b) 1 kg of 0°C ice water to 1 kg of 100°C boiling water,
(c) 1 kg of 100°C boiling water to 1 kg of 100°C steam, and
(d) 1 kg of 0°C ice to 1 kg of 100°C steam.