The Van der Waals constant 'a' for the gases | vedclass

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(C) The Van der Waals constant '$a$' is a measure of the magnitude of the attractive forces between the gas molecules.Greater the value of '$a$',stron

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$NH_3$

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(C) The Van der Waals constant '$a$' is a measure of the magnitude of the attractive forces between the gas molecules.Greater the value of '$a$',stronger are the intermolecular forces of attraction.Stronger intermolecular forces make it easier for a gas to be liquefied.Comparing the given values: $a(NH_3) = 4.170 > a(CH_4) = 2.253 > a(N_2) = 1.390 > a(O_2) = 1.3$.Since $NH_3$ has the highest value of '$a$',it can be most easily liquefied.

The Van der Waals constant '$a$' for the gases $O_2$,$N_2$,$NH_3$ and $CH_4$ are $1.3$,$1.390$,$4.170$ and $2.253 \ L^2 \ atm \ mol^{-2}$ respectively. The gas which can be most easily liquefied is

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