For the reaction , a mixture contains partial pressures , , and at . If , what is the state of the s — Chemical Equilibrium Chemistry Question
Question
For the reaction $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$, a mixture contains partial pressures $P_{H_2} = 2\text{ atm}$, $P_{N_2} = 1\text{ atm}$, and $P_{NH_3} = 3\text{ atm}$ at $725\text{ K}$. If $K_p = 4.28 \times 10^{-5}\text{ atm}^{-2}$, what is the state of the system?
Answer: B
💡 Solution & Explanation
$Q_p = (P_{NH_3})^2 / (P_{N_2} \cdot P_{H_2}^3) = (3)^2 / (1 \cdot 2^3) = 9/8 = 1.125\text{ atm}^{-2}$. Comparing $Q_p$ with $K_p$: $1.125 \gg 4.28 \times 10^{-5}$. Since $Q_p > K_p$, the net reaction will proceed in the backward direction.
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