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3.0 moles of PCl(5) kept in 1 L closed r...

3.0 moles of `PCl_(5)` kept in 1 L closed reaction vessel was allowed to attain equilibrium at 380 K. The composition of the mixture i.e., `PCl_(5)` and `PCl_(3)` respectively at equilibrium

A

1.71, 2.25

B

1.59, 1.61

C

1.41, 1.59

D

1.41, 1.41

Text Solution

Verified by Experts

The correct Answer is:
C
`"Initial conc. "underset(3.0)(PCl_(5(g)) Leftrightarrow underset(0)(PCl_(3(g)) +underset(0)(Cl_(2(g))`
`"At equilibrium 3-x x x "`
`K_(c)=(x^2)/(3-x)=1.8 rArr x=1.59`
Conc. of `PCl_3` at equilibrium =1.59
Conc. of `PCl_5` at equilibrium =3-1.59 =1.41
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