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The putial pressure of ethane over a sat...

The putial pressure of ethane over a saturated solution containing 6.56 `xx 10^(-2)` g of ethane is 1 bar.if the solution contains 5.0 `xx 10^(-2)` g of ethane, then what will be the partial pressure of the gas ?

Text Solution

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Let the Henry.s law constant be `K_(H)` and no. of moles of solvent be M.
Partial pressure of ethane = `K_(H)` x mole fraction of ethane
` I = K_(H) xx (6.56 xx 10^(-2))/((30)/(M)) `
`K_(H) = (M xx 30)/(6.56 xx 10^(-2))`
Now the partial pressure of ethane containing 5.0 `xx 10^(-2)` will be
` = (M xx 30)/(6.56 xx 10^(-2)) xx (5.0 xx 10^(-2))/(30 xx M)`
= 0.762 bar.
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