Question

The equilibrium constant for the reaction $w+x\rightleftharpoons y+z$ is 9. If one mole of each of wand x are mixed and there is no change in volume, the number of moles of y for formed is :

• A. 0.1
• B. 0.5
• C. 0.75
• D. 0.54

Answer 1

The correct option is C 0.75

$\underset{\underset{1-x}{1}}{w}+\underset{\underset{1-x}{1}}{x}\rightleftharpoons \underset{\underset{x}{0}}{y}+\underset{\underset{x}{0}}{z},K=9$
$K=9=\frac{x^2}{(1-x{)}^2}$
$\therefore x=0.75$
Moles of $y=x=0.75$