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Topic: Gas and Equilibrium Questions  (Read 4620 times)

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alexpos

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Gas and Equilibrium Questions
« on: November 06, 2005, 06:59:51 PM »
Please make your best effort to answer my questions. There are the select few i did not get from two chapters of homework.

1.) (See attachment).

I'm not quite sure how to work with this question. I assume i must use partial pressures. But don't really understand how to start. I assure you i made an honest attempt to do this question, but really can't figure it out.

2.) A mixture initially consisting of 2 mol CO and 2 mol H2 comes to equilibrium with methanol. At equilibrium, what happens to the amount (in mols; e.g. less than 1 mol, more than 1 mol) of CH3OH?

I assume that there will be less than 1 mol of CH3OH, but can not figure out how to put this into words. Could anyone explain why?

3.) At 850 degrees and 1.0 atm pressure, a gas mixture is in equilibrium is 90.55% CO by mass.

So: C(s) + CO2 (g) <--> 2CO(g)

Calculate Kc.

I assumed 100g of mixture. Therefore, there is 90.55 grams of CO, which can be converted into mols (3.2 mols). By using ratios, i conclude that there is 1.6 C and 1.6 mol of CO2. But this doesn't seem right and does not give me the correct answer.

4.) If i am told that in an equilibrium, the reactant (e.g. 10 mols in 1 L) dissociates to an extent of e.g. 9.5 percent, am i saying that the initial concentration is 10, and that the equilibrium concentration of that reactant is 10 - 0.095*10 ?

Thank you very much.

« Last Edit: November 06, 2005, 07:00:27 PM by alexpos »

Offline AWK

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Re:Gas and Equilibrium Questions
« Reply #1 on: November 07, 2005, 01:55:25 AM »
hint for 1 - calculate moles of both gases

hint for 2 - write down a balanced reaction

hint for 3 - do not take into account a solid C
« Last Edit: November 07, 2005, 01:59:55 AM by AWK »
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alexpos

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Re:Gas and Equilibrium Questions
« Reply #2 on: November 08, 2005, 09:22:27 PM »
Thanks

Anyone able to help with number 4?

Offline AWK

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Re:Gas and Equilibrium Questions
« Reply #3 on: November 09, 2005, 08:59:08 AM »
4 -OK
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Offline Donaldson Tan

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Re:Gas and Equilibrium Questions
« Reply #4 on: November 11, 2005, 12:12:31 PM »
you did (4) correctly
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

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