Question

Phosphorus pentachloride dissociates as follows, in a closed reaction vessel,$$PCl_5\rightleftharpoons PCl_3(g)+Cl_2(g)$$If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of $$PCl_5$$ is x, the atrial pressure of $$PCl_3$$ will be:

A
(2x1x)P
B
(xx1)P
C
(x1x)P
D
(xx+1)P

Solution

The correct option is D $$\left(\dfrac{x}{x+1}\right)P$$Let us consider the problem:-$$\mathop {PC{l_5}}\limits_{1 - x} \rightleftharpoons \mathop {PC{l_3}}\limits_x \left( g \right) + \mathop {C{l_2}}\limits_x \left( g \right)$$There fore,$$PC{l_3} = \left( {\frac{x}{{1 + x}}} \right) \times P$$Chemistry

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