A British thermal unit (Btu) is defined as the quantity of heat required to change the temperature

Question:

A British thermal unit (Btu) is defined as the quantity of heat required to change the temperature of 1 lb of water by 1 °F. Assume the specific heat capacity of water to be independent of temperature. How much heat is required to raise the temperature of the water in a 40 gal water heater from 48 to 145 °F in

(a) Btu;

(b) kcal;

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