For the system 2so2g o2g 2so3g dh 0 assume that one has an...

For the system: 2SO2(g) + O2(g) → 2SO3(g), ΔH < 0 Assume that one has an equilibrium mixture of these substances. Predict the effect of each of the following changes on the value of the equilibrium constant and on the number of moles of SO3 present in the mixture at equilibrium. Briefly account for each of your predictions. (Assume that in each case all other factors remain constant.) a) Decreasing the volume of the system. (2 points) b) Adding oxygen to the equilibrium mixture. (2 points) c) Raising the temperature of the system. (2 points)

Transcript

00:01 So i'm going to answer your question twice.

00:03 The first one is going to be the simple push -pull -la -la -lis -chry principle version.

00:08 And the second one, i'll actually show you k and how it affects it with a little bit of math.

00:14 So rewriting this, we're going to have 2s02 plus o2 goes back and forth into 2 -s -o -3.

00:25 And i see that delta h is negative, so this is an exothermic reaction.

00:29 So i'm just going to write plus heat because heat's going to be a product.

00:34 So in the first one that we're going to look at, we are adding oxygen.

00:39 So if i'm putting something on one side, it's going to shove this to the other side.

00:45 That's the way that we relieve the stress, so to speak.

00:48 So this is going to increase products.

00:52 If i end up raising the temperature, well, i can treat the temperature just like i did o2.

00:58 So if i make heat get bigger, well, it's going to go back the other way, and i'm going to take some products and convert them into reactants.

01:09 Okay, finally, what would happen if i decrease the volume? in this case, pv equals nrt, since we're talking about gases, pressure, since we're talking about kp, is nrt over v.

01:23 So as v goes down, pressure goes up.

01:26 So you have to look at what side has more gases.

01:29 On the left, we have a total of three gases.

01:33 And on the right, we have a total of two gases.

01:35 So to relieve the pressure, the high pressure side is going to go to the low pressure side.

01:41 In this case, we're going to make some more products.

01:47 So let's look at kp...