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For part a, the pressure is held constant. I know we are multiplying by the number of moles of Kr by the change in temperature but i just don't understand where they are getting the rest. When I checked the solution manual for part a, they were multiplying the change in temperature by the number of moles by 20.8 J/g C. Could someone explain why they used that number? and how we are supposed to find it?
Within the text(and the equation sheet on Prof. Lavelle's website), we can find that the olar heat capacity of a monoatomic ideal gas at constant pressure to be 5/2R. Since R is 8.314, 5/2R is the 20.8 J/gC you were looking for.
For this question, you would use q=mC(delta)T. For part a, where the pressure is held constant (Cp), C would be equal to (5/2)R, where R=8.314. In part b, where the volume is held constant (Cv), C would be equal to (3/2)R, where R is also 8.314. So basically, you would just replace the "C"s in q=mC(delta)T with either (5/2)R at a constant pressure or (3/2)R at a constant volume.
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