To help keep his barn warm on cold days, a farmer stores 827 kg of solar-heated water (Lf = 3.35E+5 J/kg) in barrels. For how many hours would a 1.89 kW electric space heater have to operate to provide the same amount of heat as the water does, when it cools from 11.4 to 0°C and completely freezes?

Any help would be great, Thanks

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