Wednesday 15 August 2012


Help with this tough AP Chemistry Problem?

N2(g) + 2O2(g) <-->N2O4(g)

If the value of the equilibrium constant with regard to pressure (Kp) is found to be 1.5 at 15°C, what is the value of the eqilibrium constant with regard to concentration?
(R = 0.0821 L•atm/(mol•K))



a. 8.4 x 102
b. 2.3
c. 9.4 x 107
d. 2.7 x 10–3

Best Answer - Chosen by Voters

Assume that the unit of Kp is atm-2.

Kp = Kc ( RT) ^ -2

Substitute the values into the equation, (a) is the answer.

T= 15 + 273 K
-2 is the number of moles of the products minus the number of moles of ractants. ( 1 - 3 = -2 )

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