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3 volumes N

_{2}and 1 volume of H

_{2}react at 344 degrees Celsius to form NH

_{3}. The equilibrium total pressure is 110 ATM and is 41.49% NH

_{3}by volume. Find Kp assuming the gases behave ideally.

So I started by assuming that I had 100L of gas. I worked the ICE table like so:

3H2 + N2 <--> 2NH3

75L_____25L_____0L

-3x_____-x______+2x

12.765L_4.255L___41.49L

Well this gives me volumes. But it's wrong. This is clearly not working. How can I go about it correctly?