For a solution containing a non-volatile solute, the relative lowering of vapour pressure is 0.2. If the solution contains 5 moles in all, then the number of moles of solvent in the solution is:
4
3
5
2
A
2
B
4
C
5
D
3
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Solution
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ΔPP0=Xsolute
Xsolute=0⋅2
nsolutentotal=0⋅2
nsolute=0⋅2×5mol=1mol
Then nsolvent=5−1=4moles
Hence, the correct option is A
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