### Question 11.89

Posted:

**Thu Jan 17, 2019 10:05 pm**How do we know that the coefficient for A and C is 2 based on the graph that is given?

Created by Dr. Laurence Lavelle

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

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=49&t=40155

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Posted: **Thu Jan 17, 2019 10:05 pm**

How do we know that the coefficient for A and C is 2 based on the graph that is given?

Posted: **Thu Jan 17, 2019 10:20 pm**

Based on the plot you know the initial kPa and the kPa at equilibrium. So you can draw out an ICE box.

A B C

I 28 0 0

C (-10) (+5) (+10)

E 18 5 10

Hence knowing the initial and equilibrium you can determine the change, which would be 10, 5, and 10. You can simplify this ratio to 2:1:2, thus you get

2A -> B + 2C

A B C

I 28 0 0

C (-10) (+5) (+10)

E 18 5 10

Hence knowing the initial and equilibrium you can determine the change, which would be 10, 5, and 10. You can simplify this ratio to 2:1:2, thus you get

2A -> B + 2C