Question

At ${600}^{\circ }C$ , $K_p$ for the following reaction is 1 atm $X\left(g\right)\rightleftharpoons Y\left(g\right)+Z\left(g\right)$. At equilibrium, 50% of X(g) is dissociated. The total pressure of the equilibrium system is P atm. What is the partial pressure (in atm) of X(g) at equilibrium ?

• A. 1
• B. 4
• C. 2
• D. 0.5

Answer 1

Answer: (A)

1

$X\left(g\right)\rightleftharpoons Y\left(g\right)+Z\left(g\right)$

t = 0 $P_X$ 0 0
At eq. $0.5P_X$ $0.5P_X$ $0.5P_X$
$K_p=0.5P_X=1$

$=>P_X=2$
Partial pressure of $X$ at equilibrium $=0.5P_X=1atm$

So, the correct option is $A$