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  4. Kp for the reaction A leftharpoons B is 4. If initially only A is present then what will be the partial pressure of B after equilibrium ?

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Q. $K_p$ for the reaction $A \rightleftharpoons B$ is $4$. If initially only A is present then what will be the partial pressure of B after equilibrium ?

AIIMSAIIMS 2016Equilibrium

Solution:

Assuming that reaction is started with $1$ mol of A and at equilibrium $x$ moles of A have reacted,
image
At equibrium $ 1-x mol$ $x$ mol
$K_{p}=\frac{P_{B}}{P_{A}}=4 \Rightarrow \frac{x}{1-x}=4 \Rightarrow x =0.8$