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Rachel Kwan 1B
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Joined: Wed Nov 18, 2020 12:23 am


Postby Rachel Kwan 1B » Mon Jan 11, 2021 10:50 am

a) In an experiment, 2.0 mmol Cl2(g) was sealed into a reaction vessel of volume 2.0 L and heated to 1000. K to study its dissociation into Cl atoms. Use the information in Table 5G.2 to calculate the equilibrium composition of the mixture. (b) If 2.0 mmol was placed into the reaction vessel instead of the chlorine, what would be its equilibrium composition at 1000. K? (c) Use your results from parts (a) and (b) to determine which is thermodynamically more stable relative to its atoms at 1000. K, Cl2, or F2

For part a, how do you know whether to use the K or the Kc value that is given in the Table? They are different values, one being 1.0 x 10^-3 and the other being 1.0 x 10^-7. The Cl2 is a gas, so I would think that I would have to use a Kp value. However, there are no Kp values in the Table.

Kayko Lee 1C
Posts: 114
Joined: Wed Sep 30, 2020 9:39 pm

Re: 5I.13

Postby Kayko Lee 1C » Mon Jan 11, 2021 10:54 am

The way I discerned the two was whether the question asked for equilibrium or equilibrium *composition* so then I would look at Kc but correct me if I'm wrong on my reasoning

Marisa Gaitan 2D
Posts: 107
Joined: Wed Sep 30, 2020 9:47 pm
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Re: 5I.13

Postby Marisa Gaitan 2D » Mon Jan 11, 2021 11:36 am

I agree with the post above. I used the Kc value because the problem gives you the amount in mmol which you can then convert to concentration.

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