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S34.2 g of cane sugar is dissolved in 180 g of water. The relative lowering of vapour pressure will be

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S34.2 g of cane sugar is dissolved in 180 g of water. The relative lowering of vapour pressure will be
A. `0.0099`
B. `1.1597`
C. `0.840`
D. `0.9901`
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Correct Answer - A
`(p^(@)-p_(s))/(p^(@))=((w_(2))/(m_(2)))/(w_(1)/m_(1)+w_(2)/m_(2))`
`=((34.2)/(342))/(34.2/342+180/18)`
`=(0.1)/(10.1)=0.0099`
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