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# Help with a Rate Equation question Watch

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1. Hi guys, I need help deducing the rate equation of this question. I managed to get the order number of Cl2 but I'm not sure how to get the order number of PCl3 as there's no 2 concentration for Cl2 that's the same so I can't go about making a comparison.
Here's the question btw, thanks
https://m.imgur.com/gallery/n5hNM
2. (Original post by Rnddlcrz)
Hi guys, I need help deducing the rate equation of this question. I managed to get the order number of Cl2 but I'm not sure how to get the order number of PCl3 as there's no 2 concentration for Cl2 that's the same so I can't go about making a comparison.
Here's the question btw, thanks
https://m.imgur.com/gallery/n5hNM
OK, so you have found the order wrt chlorine is 2.

Now you can look at experiments 1 and 3.

You will see that the concentration of chlorine doubles from 1 to 3 therefore you would expect the rate to multiply by 4.

So multiply the rate of 1 by 4 and then see the factor that relates it to the actual rate in expt. 3 must be due to the doubling of the other component.

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Updated: October 5, 2016
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