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How many kilowatt-hours of energy are necessary to heat the air in the house from 9∘C to 30∘C? The heat capacity of air is 1.03 J/g∘C.A room contains 45kg of air.

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q needed to heat the air is
q = mass air x specific heat air x (Tfinal-Tinitial)

Then 1 watt*s = J
Convert J to watt and then to kW and kW-hr.

0.30 kW-hr

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