You wish to measure the changes in pressures of gases during the course of a reaction using a closed-end mercury manometer.Suppose 758 mmHg N₂O₄ is allowed to react to form NO₂ according to the reaction N₂O₄ (g) $\rightarrow$ 2 NO₂ (g).The total pressure you measure as the reaction proceeds is the sum of the pressures of N₂O₄ and NO₂ present.When the total pressure is 1039 mmHg, what is the pressure of N₂O₄?

Question

Quizplus · Accepted Answer

The total pressure is the sum of the partial pressures of N2O4 and NO2. Initially, the partial pressure of N2O4 is 758 mmHg and the partial pressure of NO2 is 0 mmHg. As the reaction proceeds, the partial pressure of N2O4 decreases and the partial pressure of NO2 increases. When the total pressure is 1039 mmHg, the partial pressure of N2O4 is 477 mmHg.

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