Question

Consider the following reaction, taking place in a container fitted with a movable piston.
$2S{O}_2\left(g\right)+O_2\left(g\right)\to 2S{O}_3\left(g\right)$
Suppose we place two moles each of $S{O}_2$ and $O_2$ in the reaction vessel at ${25}^{\circ }C$, and adjust the volume to give a total pressure of $1.0atm$. The reaction is ignited by a spark, and goes to completion. The temperature is returned to ${25}^{\circ }C$.
Which of the following best describes this system after reaction is complete?

• A. $S{O}_2$ is limiting. The volume of the system remains the same.
• B. Neither reactant is limiting. The volume of the system decreases.
• C. $S{O}_2$ is limiting. The volume of the system decreases.
• D. $O_2$ is limiting. The volume of the system remains the same.

Answer 1

Answer: (C)

$S{O}_2$ is limiting. The volume of the system decreases.

Here $S{O}_2$ is limiting regent .After complete of reaction $S{O}_2$ totally react with $O_2$ molecule .There is no available moles of $2S{O}_2$.