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Q.

One mole of A_(g)is heated to 300⁰C in a closed one litre vessel till the following equilibrium is reached.
$large {A_{left( g right),}}, Leftrightarrow ,{B_{left( g right)}}$
The equilibrium constant of the reaction at 300⁰C is 4. What is the conc. of B (in, mole. lit^-1 ) at equilibrium ?

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a

0.2

b

0.6

c

0.8

d

0.1

answer is C.

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Detailed Solution

n_A = 1 mole

rightleftharpoons

let 'x' moles of 'A' reacted at equilibrium

left( {frac{{1 - x}}{V}} right)

left( {frac{x}{V}} right)

{K_C} = frac{{left[ B right]}}{{left[ A right]}}

given K_C = 4

$4 = \frac{[\frac{x}{v}]}{[\frac{1 - x}{v}]}$

4 =

frac{x}{{1 - x}}

4 - 4x = x

boxed{x = 0.8}

therefore {left[ B right]_{eq}} = x = 0.8M

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