This is my last homework problem and I can't figure out how todo it. "A carnot air conditioner takes energy from the thermalenergy of a room at 70 F and transfers it to the outdoors, which isat 96 F. For each joule of electric energy required to operate theair conditioner, how many joules are removed from the room?
The answer is 21 J but I can't find the formula's, etc tofigure this out.

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