If a substance ' A ' dissolves in solution of a mixture of ' B ' and ' C ' with their respective number of moles as n _ A , n _ B and n _ C , mole fraction of C in the solution is:

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Quantrex Academy · Accepted Answer

Correct answer: B. n _ C n _ A + n _ B + n _ C

Mole fraction is defined as the amount (number of moles or molecules) of a constituent or component divided by the total amount of all the constituent or component present.
Mole fraction $= \dfrac{Numberofmolesofcompnent}{Totalnumberofmolesofallthecomponents}$
Suppose we have a mixture with $3$ components A, B and C.
Mole fraction of $C$ $= \dfrac{{n}_{C}}{{n}_{A} + {n}_{B} + {n}_{C}}$
Hence, the answer is option B.

If a substance ' A ' dissolves in solution of a mixture of ' B '...

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