34.2 g of cansugar is dissolved in 180 g of water. The relative lowering of vapour pressure will be

Options

A. 0.0099
B. 1.597
C. 0.84
D. 0.9901

Answer

A

Explanation

`(P_(1)^(@)-P)/P_(1)^(@)=(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`