## 6th edition hw problem 11.7

905084274
Posts: 42
Joined: Fri Sep 28, 2018 12:22 am

### 6th edition hw problem 11.7

I don't understand how you can identify which flask represents the point in time at which the reaction has reached equilibrium? Can someone please explain this. I tried counting out the number of X2 molecules as well as the dissociation of diatomic molecules... The answer is flask #3 but I don't know why.

Kate_Santoso_4F
Posts: 72
Joined: Fri Sep 28, 2018 12:29 am

### Re: 6th edition hw problem 11.7

You must count the number of diatomic molecules in each of the flasks. It goes from 11 to 8 to 5 to 5 from left to right. Since there was no change after the third flask, equilibrium is reached there.

905084274
Posts: 42
Joined: Fri Sep 28, 2018 12:22 am

### Re: 6th edition hw problem 11.7

Thank you! How do you find the % decomposition? it says (6/11) x 100% but where does 6 come from?

Amy Dinh 1A
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

### Re: 6th edition hw problem 11.7

905084274 wrote:Thank you! How do you find the % decomposition? it says (6/11) x 100% but where does 6 come from?

You start out with 11 X2 molecules, and after the reaction reaches equilibrium, you are left with 5 X2 molecules. This means that 6 of the initial 11 X2 molecules decomposed to X.

Hope this helps!