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Van der Waal's Forces

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What is the value of compressibility factor in terms of vander waal cons†an t at different conditions of pressure and volume?Why is Z>1 for H2 and He gas

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Q. The compression factor (compressibility factor ) for one mole of a Vander Waals gas at

0^{\circ} C

and atmospheric pressure is found to be 0.5. Assuming that the volume of a gas molecule is negligible, calculate the Vander Waals constant 'a':

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. Assuming the volume of gas molecules to be negligible. The value of vander Walls constant

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Q. Real gases show deviations from ideal gas law because molecules interact with each other. At high pressures molecules of gases are very close to each other. At very low temperatures intermolecular forces become significant. The deviation from ideal gas behaviour can be measured in terms of compressibility factor

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Z = P V / n R T

) . Taking the pressure and volume corrections due to intermolecular forces vander waals corrected the ideal gas equation.
In vander waals equation of state for non ideal gases, the term that accounts for intermolecular forces

Q. For a real gas, the compressibility factor

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