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Q. The equilibrium constant for the reaction.
$CO ( g )+ H _{2} O ( g ) \rightleftharpoons CO _{2}( g )+ H _{2}( g )$ is $5.$ How many moles of $CO _{2}$ must be added to $1$ liter container already containing $3\, mol$ each of $CO$ and $H _{2} O$ to make $2\, M$ equilibrium concentration $CO$?

Equilibrium

Solution:

image

$5=\frac{(x+1)}{4}=20=x +1$

$\Rightarrow x=19$