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How many moles of Th (NO3)4 should be di...

How many moles of `Th (NO_3)_4` should be dissolved in 15 moles of water so that vapour pressure of water is reduced by 40%: a)1 b)2 c)3 d)4

A

1

B

2

C

3

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
`(P^(@)- P_(s))/(P_(s)) = (n)/(N) xx i= (5n)/(15)` (1mole of Th `(NO_(3))_(4)` gives 5 mole)
`(100-60)/(60)= (5n)/(15) therefore n=2`
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