### Textbook Problem 11.47

Posted:

**Fri Nov 24, 2017 2:23 pm**I am very confused as how to find the percent decomposed of a reactant. When using the ICE table for this problem, I keep getting that PCL3 is 73% decomposed.

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=49&t=23870

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Posted: **Fri Nov 24, 2017 2:23 pm**

I am very confused as how to find the percent decomposed of a reactant. When using the ICE table for this problem, I keep getting that PCL3 is 73% decomposed.

Posted: **Sat Nov 25, 2017 8:09 pm**

For part a for 11.47 I got x=.01 mol per Liter.

For part b, the question is asking what percentage of the PCL_{5} has decomposed at equilibrium. Since x=.01 mol per Liter, we know that at equilibrium the concentration of PCl_{5} is .009 mol per Liter. That means .01 M of PCl_{5} has decomposed.

.01 M divided by .019 M (initial concentration)= 53%.

For part b, the question is asking what percentage of the PCL

.01 M divided by .019 M (initial concentration)= 53%.