First slide

Gaseous state

Question

Gas O₂ N₂ NH₃ CH₄
a 1.360 1.390 4.170 2.253
The table indicates the value of van der Waals' constant a. (in L² atm mol^-2 ). The gas which can most easily be liquefied is

Moderate

A

O₂
B

N₂
C

NH₃
D

CH₄

Solution

a (van der Waals' constant) is a measure of attractive force. Larger the value of a greater the liquefaction,

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