Assume the air in a room is a perfect diatomic gas. You come into the room one d

Question

Assume the air in a room is a perfect diatomic gas. You come into the room one day and find the temperature is 20 degree C. You turn up the thermostat, and 45 minutes later the temperature has risen to 25 degree C. Has the internal energy of the air in the room increased, decreased or remained essentially the same? Defend your choice qualitatively and quantitatively using concepts and relations from Chapter 18 and 19(Temperature, Heat and the First Law of Thermodynamics and The Kinetic Theory of Gases)..Please respond with at least a paragraph explanation with formulas and using the chapter topics I mentioned..Thank You

Explanation / Answer

change in internal energy = 5R(25-20)/2 = 25R/2

change in internal energy is positive

hence , internal energy of room has increased

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