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Postby Michelle_Nguyen_3F » Tue Nov 29, 2016 11:36 pm

Hi! I know somebody already asked this question, but I was still confused about the explanation.

The question reads: "The two air pollutants SO3 and NO can react in the atmosphere as follows: . b) Give that a t a certain temperature K = 6.0 x 10^3, calculate the amount (in moles) of NO that must be added to 1.00 L vessel containing 0.245 mol SO3(g) to form 0.240 mol SO2 (g). Why is it that the the solution manual says that at equilibrium, SO3=0.245 moles - 0.240 moles = 0.005 moles? Thank you!

Allison Suzuki 2B
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Joined: Wed Sep 21, 2016 2:57 pm

Re: 11.117

Postby Allison Suzuki 2B » Wed Nov 30, 2016 12:46 am

In the problem, you're given two values: 0.245 mol SO3 and 0.240 mol SO2. The volume is 1.00 L, so your concentration will be of the same values. When you create your ICE table, the reaction initially starts off with none of the product (SO2), and ends up with 0.240, you can conclude that the change in concentration, +x, equals 0.24.
Going back to SO3, the change will be -x, and since x=0.24, you can conclude that the concentration will be 0.245-0.240 = 0.005

Hope this helps!

Paula Dowdell 1F
Posts: 72
Joined: Tue Nov 15, 2016 3:00 am

Re: 11.117

Postby Paula Dowdell 1F » Wed Dec 06, 2017 9:50 pm

For the same reasons NO is x-0.240

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