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Question

The value of Cp - Cv is 1.09 R for a gas sample in state A and is 1.00 R in state B. Let TA, TB denote the temperature and pA and pB denote the pressure of the states A and B respectively. Then

Options

A.pA < pB and TA > TB
B.pA > pB and TA < TB
C.pA = pB and TA < TB
D.pA > pB and TA < TB

Solution

(D)
For an ideal gas    
CP − CV = R
If   CP − CV  = 1.09 R.
or    pA > pB     TA < TB
Then gas will be real. Thus  pressure is high and temperature is low for real gas.

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