The vapour density of undecomposed is . When heated, it dissociates into , and the equilibrium vapou — Chemical Equilibrium Chemistry Question
Question
The vapour density of undecomposed $N_2O_4$ is $46$. When heated, it dissociates into $NO_2$, and the equilibrium vapour density decreases to $24.5$. What is the percentage dissociation of $N_2O_4$ at this temperature?
Answer: B
💡 Solution & Explanation
For $N_2O_4 \rightleftharpoons 2NO_2$, $n = 2$. The degree of dissociation $\alpha = (D - d) / ((n - 1)d) = (46 - 24.5) / (24.5) = 21.5 / 24.5 \approx 0.877$ or $87\%$.
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