Chemistry Help! Please???

Posted on 2015-10-09 06:21:00 in Chemistry by GERG

1)K. The reaction 2N2O(g)->2N2(g) + O2(g) has Kc = 3.5 × 10-18 at a particular temperature. If 0.20 mol of N2O is placed in a 1.00 liter container, what will be the N2 concentration when equilibrium is reached?

1. 4.4 × 10-9 mol/liter 4. 3.3 × 10-7 mol/liter 5. None
2. 3.2 × 10-8 mol/liter
3. 4.5 × 10-6 mol/liter

(I got 5 none of these answers are correct)

2) Bromine and chlorine dissolve in carbon tetrachloride and react to form BrCl:

Br2 + Cl2--> 2BrCl (in CCl4)

Under equilibrium conditions [Br2] = [Cl2] = 0.00430 M and [BrCl] = 0.0114 M.
The addition of 0.100 moles of Br2 to exactly one liter of this mixture disturbs the equilibrium. Assuming a negligible volume change, calculate the concentration (in mol/liter) of BrCl once equilibrium has been reestablished.
(I got .0190M)
Any help on either on how to do, or any confirmation of my answers would be great! Thanks so much!!!!!

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