If 285.5 mL SO2 is allowed to react with 158.9 mL O2 (both measured at 315 K and

Question

If 285.5 mL SO2 is allowed to react with 158.9 mL O2 (both measured at 315 K and 50.0 mmHg), what is the limiting reactant and the theoretical yield of SO3?

Explanation / Answer

These gas problems are much easier to do than other reaction problems, because you can work directly in volumes, and not have to do the complicated molar calculations> From the balanced equation: 2SO2 (g) + O2 (g) = 2SO3 2volumes of SO2 will react with 1 volume of O2 to produce 2 volumes of SO3 You have 292 ml of SO2. This will require 285.5/2 = 158.9ml O2. You have 158.9ml O2. You have more than the required volume of O2. The SO2 is limiting reactant Therefore you will produce the same volume of SO3 as you have volume of SO2: Answer: 285.5ml of SO3 will be produced, in theory.

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