### homework 11.7 6th edition

Posted: **Sun Jan 13, 2019 10:30 pm**

by **Celeste 1I**

for part c) it asks "assuming that the initial pressure of X2 was 0.10 bar, calculate the value of K for the decomposition." the only other information given is that the reaction is a dissociation of a diatomic molecule, X2 over time and that it reaches equilibrium after 54.5% of molecules have dissociated. I don't know how to find this with only that information.

### Re: homework 11.7 6th edition [ENDORSED]

Posted: **Mon Jan 14, 2019 11:42 am**

by **2c_britneyly**

Because they tell you it reaches equilibrium after 54.5% of the molecules dissociate, you can set up an ICE table, with the initial as .1 and the change as -(.545x.1). That will give you the final partial pressure of X2 and you can find the final pressure of 2X by doubling the change of X2 due to the mole ratio. Then you can set up your equilibrium expression, plug in the equilibrium values, and find K.