Texas Tech University
Instantaneous Rate - Example 1


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Video Transcript

So let's make an example, uh, considering the instantaneous rates, But I really would like to say, Do not worry. They're probably not going to ask you this in the exam, because to be able to answer these questions, ume or likely need an exile sheath where you can actually draw the curves. So supposedly we have h two plus cell to gives us to HCL reaction, and this blue curve is going to be our A C L concentration start from zero and goes up, whereas this red curve is going to be showing us the consumption off H two. And let's say they're asking us the instantaneous rate at 72nd for both of them. So we really need to points for on this this tangent, we'll see. We picked two points over here, and we are going to have this triangle since we need does angle. What? The tangent off this angle is going to give us be over a and this is going to give us the instantaneous rate. And similarly, we need two points on the slope. This name them C and D, and what we need is this angles tangent. So that is going to give us C word d How you're going to pick which angle you should Look, if you should look at this angle or that angle If you're unsure, just think about that. What you need to do is concentration over time. So time has to be in the dinner, Meritor, whereas theme, the concentration has to be on the numerator. Right. So where is the concentration this guy? So be is when you take the tension, it iss the guy on the front. Do I buy the guy in? Neighbor B is at the top. So be is our concentration. This is the same C is at the top. So this is our, um, concentration over here. So let's say we have this two points and for this guy, we have these two points. Unless, say, the numbers would read for the hydrogen, it will be the conception. Negative 0.28. This is the concentration change from here to here. Excuse me? The hydrogen. The concentration changed from here to here. This this little change over here and this is going to give us 4.6 times tend to the part of negative tree. And this is for the hydrogen. But what about the HCL? So for HCL, we need this guy or here and let's say we have those points and that's going to be 56. Do I buy 0.56? Do I buy a 0.16 again? I'll get these numbers. They're pretty much you're going to come up with those numbers on exile if you plot thes, but let's save your did And these are numbers. So there was a negative over here. Over here, there's no negative. But this time since this is to a C. L. You need to write and one over to over here, and then since these two have the same slops, we're going to get the same result.

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