- #1
terryds
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Homework Statement
At certain pressure and temperature in a 2 L closed flask, equilibrium reaction undergoes such as :
N2 (g) + O2 (g) ↔ 2NO (g)
Each concentration of the substances in equilibrium is 0.8 M.
If we add 2 mole of NO2 gas into the flask, then the concentration of N2 gas in the new equilibrium is ...
A. 1.13 M
B. 1.80 M
C. 2.20 M
D. 2.60 M
E. 2.80 M
Homework Equations
[/B]
Kc = products of right molarity / products of left molarity
The Attempt at a Solution
[/B]
At initial equilibrium
Kc = (0.8)^2 / (0.8)(0.8) = 1
Change in mole = 2 mole => Change in molarity = 2 mole / 2 liter = 2 M
At final equilibrium
Kc = (1.8)^2 / (x^2)
1 = (1.8)^2 / (x^2)
x = 1.8 M
However, the answer key is A. 1.13 M
Please help what I missed