Question

For a real gas what will be the effect on value of Z above Boyle temperature

Answer 1

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The compressibility factor (Z), is the ratio of the molar volume of a gas to the molar volume of an ideal gas at the same temperature and pressure.

Deviation of real gas from ideal behaviour is expressed in terms of compressability factor (Z) mathematically expressed as Pv/nRT.

For ideal gases, Z = 1, PV = nRT.

For real gases, Z >1, PV > nRT, it refers to positive deviation i.e. the gas is less compressable than expected from ideal behaviour. 

Z <1, PV < nRT, it refers to negative deviation i.e. the gas is more compressable than expected from ideal behaviour. 

The value of Z will be greater than 1(Z>1), shows positive deviation above Boyle’s temperature.