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PracticeEx1_Soln

# PracticeEx1_Soln - Solutions for the PracticeEx 1 1(a You...

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Solutions for the PracticeEx 1 1. (a) You only need two variables out of P,V and T to define a state of a gas: True (b) The energy of ideal gas remains constant : False (c) w rev > – w irrev : True (d) Entropy is a state function: False (e) dq = 0 so dS = 0 : True 2. (a) (P 1 ,V 1 ,T) (P 2 ,V 2 ,T) and irreversible isothermal process 1 1 V RT mg P and 2 2 2 V RT mg P RT mg RT mg RT V P RT V V P w 2 ) ( 1 2 1 2 2 RT w w U q (b) 2 ln 2 ln ln 2 1 1 2 2 1 RT mg RT mg RT RT V V RT dV V RT PdV w V V V V 2 ln RT w q 3. (a) This is a isobaric process, so you can use C V . T dT R T dT C T dq dS V rev 2 3 2 ln 2 3 2 ln 2 3 ln 2 3 ln 2 3 2 3 R R V P R V P R R V P R V P R T T R T dT R S A A A A A A B B A B T T B A

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PracticeEx1_Soln - Solutions for the PracticeEx 1 1(a You...

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