## 7A.15

Shanzey
Posts: 120
Joined: Wed Sep 18, 2019 12:20 am

### 7A.15

For 7A.15, how do we know which experiments for C to use when finding the orders for A and B (since none of the C experiments remain constant as the other two change)?

JohnWalkiewicz2J
Posts: 103
Joined: Thu Jul 11, 2019 12:17 am
Been upvoted: 1 time

### Re: 7A.15

For this problem, I would suggest to start with finding what order C is in. If you compare experiements 1 & 4, you see that when C doubles and A/B stay the same, the rate is the same. So, knowing that C is in 0 order, you know that changes in concentration wont affect the rate. You can find order of A by comparing 1 and 2, and B you can find comparing 2 and 3. Hope this helps! : )

Nohemi Garcia 1L
Posts: 103
Joined: Fri Aug 02, 2019 12:15 am

### Re: 7A.15

In this case, since C is a zero order reaction (Rate=k), you won't really need to take C into account since its concentrations won't have any effect on the rate. Just solve for A and B as if C wasn't there.

805329408
Posts: 49
Joined: Wed Nov 20, 2019 12:21 am

### Re: 7A.15

Since C is a zero order reaction, you can ignore it when solving for A and B because that portion would just cancel out to 1/1 since they are both to the zeroth power.

preyasikumar_2L
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

### Re: 7A.15

Don't worry about C, it's a zero order reaction - it will have no effect on the rate. Just focus on solving for A and B.

Betania Hernandez 2E
Posts: 107
Joined: Fri Aug 02, 2019 12:15 am

### Re: 7A.15

C is zero order reaction which can be seen from experiments 1 and 4 where A and B are constant while C changes but the rate stays the same. Knowing this, C doesn't need to be taken into account since its concentration has no effect on the rate