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Moles of Na(2)SO(4) to be dissoved in 12...

Moles of` Na_(2)SO_(4)` to be dissoved in 12 mole water to lower its vapour pressure by 10 mm Hg at a temperature at which vapour pressure of pure water is 50 mm is:

A

1.5 mole

B

2 mole

C

1 mole

D

3 mole

Text Solution

Verified by Experts

The correct Answer is:
D
`(P^@ - P)/(P^@) = 10/50 = n/(N+12) :. N= 3`
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