1. The problem statement, all variables and given/known data A person living in a 4m x 5m x 5m room turns on a 100-W fan before he leaves a warm room at 100kPa, 30 degrees Celsius, hoping that when he returned in 5 hours, the room would be cooler. Disregarding any heat transfer determine the temperature of the room when he comes back. ( Assume the air to be an ideal gas with molar heat capacity C_v=3R/2). 2. Relevant equations I couldn't get any of the latex code to work in the new website format. R=k_B/N_A pV=nRT deltaU=Q+W 3. The attempt at a solution So I calculated the energy put into the system by the fan and got: E=100(60)(60)= 1,800,000 J The volume of the room doesn't change but I know the pressure will increase so therefore the temperature will increase. I'm having trouble finding out how to find this though. Would anyone be able to point me to the next step? Any help is much appreciated.