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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:

Options

  1. An C n A × n B × n C
  2. Bn C n A + n B + n C
  3. Cn C n A - n B - n C
  4. Dn B n A + n B

Correct answer

B. n C n A + n B + n C

Step-by-step solution

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 = Number of moles of compnent Total number of moles of all the components Suppose we have a mixture with 3 components A, B and C. Mole fraction of C = n C n A + n B + n C Hence, the answer is option B.

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