The specific heats at constant pressure of some common gases are provided as a thirdorder polynomial: �; < < < = � + �� + ��c + ��e, with units j/(mol k). for methane (ch4) the coefficients are � = 19.89, � = 5.024 × 10nc, � = 1.269 × 10no, � = −11.01 × 10nq. at a production facility, the gas in a 50-liter tank is compressed to 3,600 psi (gage) during which time the temperature rises to 200°f. how much heat in j is given off as the gas cools to room temperature? suppose the co

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.