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Question

The values of the Henry's law constant Ar, CO2, CH4 and O2 in water at 25 oC are 40.30, 1.67, 0.41 and 34.86 kbar respectively. The order of their solubility in water at the same temperature and pressure is

A
Ar>O2>CO2>CH4
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B
CH4>CO2>Ar>O2
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C
CH4>CO2>O2>Ar
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D
Ar>CH4>O2>CO2
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Solution

The correct option is C CH4>CO2>O2>Ar
According to Henry's law,
Pgas=KH×Xgas
Xgas(molefraction)solubility of gas1KH
KH value for Ar,CO2,CH4 and O2 are 40.30, 1.67, 0.41, 34.86 so solubility order is
CH4>CO2>O2>Ar

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