# Thermodynamics problem Help!

by rchenkl
Tags: thermodynamics
 P: 12 1. The problem statement, all variables and given/known data Five moles of an ideal monotomic gas initially occupies a volume of 100 x 10-3m3 at a temperature of 280 K. (state 1) The gas is then subject to the following processes in sequence: * heated at constant volume to a temperature of 600K (state 2) * allowed to expand isothermally to its initial pressure (state 3) * compressed isobarically to its original volume (state 1) (a) Find the pressure and volume of the gas in state 3 (b) Calculate the work done on the gas in going from state2 to state 3. (c) Calculate the heat exchanged between the gas and its environment during each of the 3 processes of the cycle 1->2, 2->3, 3->1. In each case, indicate whether the heat enters or leaves the gas. (d) Calculate the net work done on the gas in one cycle 2. Relevant equations PV=nRT=NkBT pVr=constant, r=Cp/Cv dW=-PdV W=nRT*ln(Vi/Vf) Eint=3/2NkbT Cv=5/2R 3. The attempt at a solution I'm stuck on question (a). I calculated the pressure using PV=nRT where the initial volume, temperature and number of moles of gas is provided. P=(5*8.314*280)/(100x10-3) Now, I dont know how to calculate the volume in state 3. Do I use T=600K and P=the above I calculated, to obtain the volume?
 Sci Advisor HW Helper PF Gold P: 2,532 You got it.

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