Take a ratio of the rates for those two experiments and

the ratio of the concentration of the NO for those two experiments.

Okay? So, that's what we're going to be doing.

Now, I generally like to take large divided

by small because it keeps me from having to work with fractions.

And that's how you use essentially four for the ratio of the rates.

Now, I'm looking at the concentrations up here again in these two values.

I take the ratio of rates.

Now make sure you do it in the same order as your ratio rates were.

We're doing a ratio concentration here.

I had done experiment two over experiment one.

Make sure you do experiment two over experiment one for this portion, as well.

And that gives me two.

Now, what do these numbers tell me?

I am doubling the concentration, there's the two.

I am doubling the concentration of NO.

And I'm seeing a quadrupling in the rate.

So, we say two to what power, that's my x, will give me 4.

And certainly, x is going to be two.

If I raise it to the second power, it fulfills that, and that tells me now

that the order of NO is second order, and I can put a two there for that.