A sample of is placed in a flask and heated. It dissociates according to . What is the numerical val — Chemical Equilibrium Chemistry Question
Question
A sample of $N_2O_4(g)$ is placed in a flask and heated. It dissociates according to $N_2O_4(g) \rightleftharpoons 2NO_2(g)$. What is the numerical value of the theoretical vapour density ($D$) of $N_2O_4$ used in the standard dissociation formulas?
Answer: 46
💡 Solution & Explanation
The theoretical vapour density $D$ is defined as the molar mass of the pure reactant gas divided by $2$ (with respect to hydrogen). Molar mass of $N_2O_4 = (2 \times 14) + (4 \times 16) = 28 + 64 = 92\text{ g/mol}$. Therefore, $D = 92 / 2 = 46$.
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