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The mole fraction of He gas in a saturat...

The mole fraction of He gas in a saturated solution at `20^(@)C` is `1.25 xx 10^(-6)`. Calculate the pressure of He gas above the solution . (`K_(H)` of He at `20^(@)C = 144.98 ` k bar)

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The correct Answer is:
0.174 bar
`p_(He)=K_(H)xx x_(He)=(144.97xx10^(3)" bar")(1.2xx10^(-6))=0.174" bar."`
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