Posted by Jane on Monday, October 25, 2010 at 5:42pm.
Dinitrogentetraoxide partially decomposes according to the following equilibrium:
N2O4 (g) -> 2NO2 (g)
A 1.00-L flask is charged with 0.400 mol of N2O4. At equilibrium at 373 K, 0.0055 mol ofN2O4
remains. Keq for this reaction is ?.
hOw can i set up this problem?
- Chemistry Class - DrBob222, Monday, October 25, 2010 at 6:22pm
Set up an ICE chart, substitute into the Keq expression, and solve for Keq. You want to convert moles to M (but that's easy since it's a 1 L flask.)
N2O4 = 0.400 M
NO2 = 0
NO2 = +2x
N2O4 = -x
NO2 = 2x
N2O4 = 0.400-x and the problem tells you this is 0.0055
Now do a little reasoning. Solve 0.400-x=0.0055 for x.
Multiply that by 2 to find NO2 at equilibrium.
Then substitute into Keq expression and solve for Keq.
Check my work.
- Chemistry Class - Laynie, Monday, October 25, 2010 at 6:42pm
whats the keq expression??'
sorry we're learning about ice charts tomorrow but the teacher gave us a practice worksheet for the coming quiz and i wanted to see if i could figure out some of the problems early.
- Chemistry Class - Laynie, Monday, October 25, 2010 at 6:44pm
i did everything you said and got
0.789 im at the step of setting up the keq expression
- Chemistry Class - Laynie, Monday, October 25, 2010 at 7:11pm
sorry to have gotten into this post, im solving a similar question and wanted to know how to do the final step
- Chemistry Class - DrBob222, Monday, October 25, 2010 at 8:32pm
Your 0.789 is 2x and that is (NO2).
(N2O4) = 0.0055 from the problem.
Keq expression is
Keq = (NO2)^2/(N2O4)
If 0.400-x = 0.0055, then x = 0.3945
So (N2O4) = 0.0055
and NO2 = 2x = 0.3945*2 = 0.789
Now substitute into Keq above to obtain:
Keq = (0.789)^2/(0.0055) = ??
about 113 or so.
- Chemistry Class - Jane, Monday, October 25, 2010 at 9:12pm
I got the problem from my book, and it says the answer is 0.87?
Answer This Question
More Related Questions
- chemistry - i already posted this question, but im still confused on it. ...
- college chem - N2O4 --->2NO2 a 1 liter flask is charged with .4 mols of N2O4...
- chemistry - Liquid Nitrogen tetroxide, N2O4(l), was used as a fuel in Apollo ...
- CHEMISTRY - A chemist studying the equilibrium N2O4(g)<----->2NO2(g) ...
- chem 12 - 1.00 mol of N2O4 and 1.00 mol of NO2 are placed in an 800 mL ...
- Chemistry - The reaction N2O4(g) -->2NO2(g) has Kc = 0.133 at 25 °C. What is...
- Chemistry - Dinitrogen tetroxide decomposes to nitrogen dioxide: N2O4 (g) --->...
- chemistry - A 1.00 mol sample of N2O4 (g) is placed in a 10.0 L vessel and ...
- AP Chemistry - Given: N2O4 (g) « 2NO2 (g) @ 25 degrees celcius, Kc is 5.84 x 10...
- Chem - The initial concentration for the compounds involved in the reaction ...