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What mass of solute ("molar mass=60 g mo...

What mass of solute `("molar mass=60 g mol"^(-1))` should be dissolved in 180 g water to reduce the vapour pressure to `4/5` th of pure water :

A

120g

B

175g

C

150g

D

100g

Text Solution

Verified by Experts

The correct Answer is:
C
`(P^@-(4P^@)/5)/((4P^@)/(5)) =(w xx M)/(m xxW)`
`(P^@-(4P^@)/5)/(4P^@)/5 =(w xx 18)/(60 xx 180) therefore w=150g`
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