*** 27. A physics professor has a small cabin in his back yard to use as an office. Its floor area is 4 m x 5 m and the

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27 A Physics Professor Has A Small Cabin In His Back Yard To Use As An Office Its Floor Area Is 4 M X 5 M And The 1 (185.53 KiB) Viewed 35 times

The answer is supposed to be 20.8 J/(mole*K) and 5.9 minutes. Thanks!
*** 27. A physics professor has a small cabin in his back yard to use as an office. Its floor area is 4 m x 5 m and the ceiling is 3 m high. It is very well insulated, so no heat is lost through walls or windows. During the winter, it is heated by a 1500-watt electric heater. The professor goes in the cabin on a cold morning (10° C) and turns on the heater. The initial atmospheric pressure in the cabin is 10° Pa. Assume that the windows and doors are tight, so that no air enters or leaves the cabin. Air is composed almost entirely of the diatomic molecules N, and O. Estimate the molar specific heat at constant volume for the air, and calculate how long it will take the heater to raise the temperature to a more comfortable 20°C.