Which of the following show maximum deviation from ideal gas 1. He 2. H2

Asked by Ashu Jain | 1st Dec, 2013, 07:44: PM

Expert Answer:

Hydrogen (H2) will show maximum deviation from ideal gas due to dipole-dipole attraction.

Hydrogen and Helium are two lightest gases known. Their molecules have very small masses. The attractive forces between such molecules will be extensively small. 

A helium molecule consists of a single small atom, and the van der Waals dispersion forces are as low as it is possible for them to be.

Like helium, a hydrogen molecule also has two electrons, and so the intermolecular forces are going to be small - but not as small as helium. In the hydrogen molecule, we have two atoms that can distribute the charges over.

As molecules get larger, dispersion forces will increase, and we may get other intermolecular forces such as dipole-dipole attractions as well. Gases made of molecules such as these will be much less ideal.

Answered by Hanisha Vyas | 2nd Dec, 2013, 12:53: PM

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