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Standard XII

Chemistry

Relating Translational KE and T

arrange O2 , ...

Question

arrange O2 , CO2 , H2, He in inc order of vanderwall constant ' a' & 'b'?

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Solution

Increasing order of ven der waal constant 'a'
He < H₂< O₂ < CO₂
Increasing order of constant b :
He < H₂ < O₂ < CO₂
The value of ‘a’ depends on intermolecular forces of attraction. The value of ‘a’ is higher for easily liquefiable gases while lower for permanent gases.
The constant ‘b’ is the effective volume of the gas molecules.

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(p + \frac{a n^{2}}{V^{2}}) (V - n b) = n R T

Where

a

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