#11 (10 marks) In the following figure, where V 23 = 3.00 V i , n moles of a dia

Question

#11 (10 marks)

In the following figure, where V23 = 3.00 Vi , n moles of a diatomic ideal gas are taken through the cycle with the molecule rotating but not oscillating (Cv = 5R/2 )

CALCULATE:

a)The heat Q12 for process 1>2 (4 marks)

b) The work W23 for process 2 > 3 (3 marks)   

#11 (10 marks) In the following figure, where V23 = 3.00 Vi , n moles of a diatomic ideal gas are taken through the cycle with the molecule rotating but not oscillating (Cv = 5R/2 ) CALCULATE: a)The heat Q12 for process 1½ >2 (4 marks) b) The work W23 for process 2 ½ > 3 (3 marks) c) The heat Q31 for process 3 ½ >1 ( 3 marks)

Explanation / Answer

specific heat for diatomic molecule is cv = 5/2 R

when ideal gas expands isothermally, work is done by the gas against the external surroundings and an equivallent amount

of heat flow from out side in to the gas .when the gas is compressed isothermally work is done on the gas .heat   

flows out from the gas.

the work done by n-moles of an ideal gas during adiabatic expansion from a temperature ti to tf  is given by

w = nr/(y-1){ti -tf}

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