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  • Please help! We have PCl5in a sealed container which decomposes to PCl3& Cl2with time. What are the mole fractions of the constituents at 50% decay in respective order PCl5,PCl3, Cl2?

We have PCl5 in a sealed container which decomposes to PCl3 & Cl2 with time. What are the mole fractions of the constituents at 50% decay in respective order PCl5, PCl3, Cl2 ?

  • Option 1)

    0.33, 0.33, 0.33

  • Option 2)

    0.33, 0.5, 0.17

  • Option 3)

    0.2, 0.4, 0.4

  • Option 4)

    0.3, 0.3, 0.4

 

Answers (1)

best_answer

As we learnt,

 

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})

 

 

                 PCl_{5}\rightarrow PCl_{3} + Cl_{2}

t = 0          1                 0              0

    t_{1}            0.5                0.5          0.5

Mole fraction of PCl5 = PCl3 = Cl2 =   \frac{0.5}{0.5+0.5+0.5} = \frac{1}{3} =0.33

 


Option 1)

0.33, 0.33, 0.33

Option 2)

0.33, 0.5, 0.17

Option 3)

0.2, 0.4, 0.4

Option 4)

0.3, 0.3, 0.4

Posted by

prateek

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