To help keep his barn warm on cold days, a farmer stores 880 kg of solar-heated water (Lf = 3.35 x105 J/kg) in barrels. For how many hours would a 1.0 kW electric space heater have to operate to provide the same amount of heat as the water does, when it cools from 10.0 to 0.0°C and completely freezes?

All I know is that you need to use the Q=mcdeltaT formula and possibly the Q=mL

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