Question

What is the value of compressibility factor 'Z' for
(a) ideal gas
(b) real gas above Boyle's temperature

Answer 1

compressibility factor :- which is defined as the ratio of measured molar volume (Vm ) of a gas to the molar volume of ideal gas . (Vm° = RT/P) at the same temperature and pressure.

1) for ideal gas ,
Vm = Vm°
so,
Z =1

2) real gas above boyles temperature ,
but what is Boyles temperature ?
the temperature at which any real gases obey ideal gases equation is known as Boyles temperature
real gas above the Boyles temperature then Vm> Vm°
so, Z > 1

Answer 2

"The compressibility factor is the ratio of molar volume of a gas to the molar volume of a ideal gas at the same temperature and pressure."

The value of Z in ideal gas is 1


The Value of Z in real gas above Boyels temperature is Z>1

The gas is less compressible than ideal bevavior.It shows the positive deviation.