A quantity of 4 g reacts with molecules and forms gas. If the total pressure of the system after rea — States of Matter and Gaseous State Chemistry Question
Question
A quantity of 4 g $\text{H}_2$ reacts with $9 \times 10^{23}$ $\text{Cl}_2$ molecules and forms $\text{HCl}$ gas. If the total pressure of the system after reaction is 700 mm, what is the partial pressure of $\text{HCl}$? Assume complete reaction.
Answer: D
💡 Solution & Explanation
H2 = 2 mol. Cl2 = 1.5 mol (limiting). Forms 3 mol HCl, 0.5 mol H2 left. Total n = 3.5. P(HCl) = 3/3.5 * 700 = 600 mm. Therefore, correct answer is D.
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