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  • I have a doubt, kindly clarify. What is the mole fraction of the substance A in the following mixture:A = 5 moles, B = 6 moles, C = 4 moles, D = 5 moles.

What is the mole fraction of the substance A in the following mixture:

A = 5 moles, B = 6 moles, C = 4 moles, D = 5 moles.

  • Option 1)

    0.20

  • Option 2)

    0.50

  • Option 3)

    0.33

  • Option 4)

    0.25

 

Answers (1)

best_answer

As we learnt in

 

Mole Fraction -

It is ratio of moles of solute or moles of solvent to moles of solution.

- wherein

If a substance ‘A’ dissolves in substance ‘B’ and their number of moles are n_{A} and n_{B} respectively; then the mole fractions of A and B are given as

Mole fraction of A = (number of moles of A)/(number of moles of solution ) = n_{A}/(n_{A}+ n_{B})

 

 

 

Moles of A = 5

Moles of B = 6 + 4 + 5 + 5 = 20

\therefore mole fraction = \frac{5}{20} = \frac{1}{4} = 0.25


Option 1)

0.20

Option 2)

0.50

Option 3)

0.33

Option 4)

0.25

Posted by

divya.saini

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