Two system PCl 5 ( g ) ⇌ PCl 3 ( g ) + Cl 2 ( g ) and COCl ( g ) ⇌ CO ( g ) + Cl 2 ( g ) are simultaneously in equilibrium in a vessel at constant volume. If some CO is introduced in the vesse

Question

Two system PCl 5 ​ ( g ) ⇌ PCl 3 ​ ( g ) + Cl 2 ​ ( g ) and COCl ( g ) ⇌ CO ( g ) + Cl 2 ​ ( g ) are simultaneously in equilibrium in a vessel at constant volume. If some CO is introduced in the vessel, then at new equilibrium, the moles of :

TestHub · Accepted Answer

The problem describes two simultaneous equilibrium systems in a vessel at constant volume:

1. $PC l_{5} (g) ⇌ PC l_{3} (g) + C l_{2} (g)$

2. $COC l_{2} (g) ⇌ CO (g) + C l_{2} (g)$ (Note: The question states $COCl (g)$ , which is likely a typo and should be $COC l_{2} (g)$ or phosgene, a common reactant in such problems. Assuming $COC l_{2} (g)$ for a valid equilibrium.)

When CO is introduced, the second equilibrium shifts left to consume the added CO, increasing $COC l_{2}$ and decreasing $C l_{2}$ . The decrease in $C l_{2}$ then causes the first equilibrium to shift right to produce more $C l_{2}$ , thereby decreasing the moles of $PC l_{5}$ .

Therefore, at the new equilibrium, the moles of $PC l_{5}$ will decrease.

The final answer is $C$

Chemistry - Chemical Equilibrium Question with Solution | TestHub

Options:

Doubts & Discussion