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Calculating Power Change

A class of 12 students taking an exam has a power output per student of 126 W. Assume that the initial temperature of the room is 19.5°C and that its dimensions are 6.20 m by 14.4 m by 3.30 m. What is the temperature (in °C, do not enter units) of the room at the end of 63.0 min if all the heat remains in the air in the room and none is added by an outside source? The specific heat of air is 831 J/ kg*°C, and its density is about 1.31à?10-3g/ cm3.

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The solution calculates a change in temperature given power, density, mass, dimensions, and specific heat capacities.