Chemical EquilibriumhardMCQ SINGLE⭐ Must-Do

Exactly of and of are kept in a flask for the reaction . At equilibrium, of is formed. What is the vChemical Equilibrium Chemistry Question

Question

Exactly $1.1\text{ mol}$ of $A$ and $2.2\text{ mol}$ of $B$ are kept in a $1\text{ L}$ flask for the reaction $A + 2B \rightleftharpoons 2C + D$. At equilibrium, $0.2\text{ mol}$ of $C$ is formed. What is the value of $K_c$?

Answer: D

💡 Solution & Explanation

$C$ formed $= 2x = 0.2 \Rightarrow x = 0.1$. Eq moles: $A = 1.1 - 0.1 = 1.0$, $B = 2.2 - 2(0.1) = 2.0$, $C = 0.2$, $D = x = 0.1$. $K_c = ([C]^2[D])/([A][B]^2) = (0.2^2 \times 0.1) / (1.0 \times 2.0^2) = (0.04 \times 0.1) / 4 = 0.004 / 4 = 0.001 = 10^{-3}$.

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