Q. If the solution contains ' $n$ ' moles of solute and ' $N$ ' moles of solvent, the mole function of the solute in the solution is equal to :

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A

$N / n + N$

B

$n / N+n$

C

$N + n / n$

D

$N + n / N$

Solution:

Explanation:
No. of solute particles $= n$
No. of solvent particles $= N$
Mole fraction of solute $= n /( n + N )$

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