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Grade: 12
        

how to express compressibility factor in terms of critical  pressure and critical volume

8 years ago

Answers : (2)

AKASH GOYAL AskiitiansExpert-IITD
419 Points
							

Dear Student

 

Z=\frac{p \tilde{V}}{R T}

 

where, p is the pressure, \tilde{V} is the molar volume of the gas, T is the temperature, and R is the gas constant.

For an ideal gas the compressibility factor is Z = 1 per definition

The reduced temperature and pressure are defined as:

  T_r = \frac{T}{T_c}  and  P_r = \frac{P}{P_c}

Tc and Pc are known as the critical temperature and critical pressure of a gas. They are characteristics of each specific gas with Tc being the temperature above which it is not possible to liquify a given gas and Pc is the minimum pressure required to liquify a given gas at its critical temperature.

 T_r = \frac{T}{T_c + 8} and  P_r = \frac{P}{P_c + 8}

 

now you can eliminate T and P and put in terms of critical temp and pressure.

 

All the best.                                                           

AKASH GOYAL

AskiitiansExpert-IIT Delhi

 

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8 years ago
vikas askiitian expert
509 Points
							

Pc = a/27b2 , Tc = 8a/27Rb , Vc = 3b

a,b are vanderwalls equation constants

Z = PV/RT = 3/8

8 years ago
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