Partial pressures and equilbrium constant pressure dependence:

Say I have a reaction: A+B = 2C+D
Considering all 4 of them are gases, my equilibirium constant would be:

K= (pD * (pC^2)) / (pA * pB)
= (xD * xC * p) / (xA * xB)

where p is the total pressure and the x's are mole fractions.
I can obviously see the pressure appearing in the expression for K, so why is it that K is independent of pressure?

I'm confused, please help?

Thanks!

Question

Partial pressures and equilbrium constant pressure dependence:

Say I have a reaction: A+B = 2C+D 
Considering all 4 of them are gases, my equilibirium constant would be: 

K= (pD * (pC^2)) / (pA * pB) 
= (xD * xC * p) / (xA * xB) 

where p is the total pressure and the x's are mole fractions. 
I can obviously see the pressure appearing in the expression for K, so why is it that K is independent of pressure? 

I'm confused, please help? 

Thanks!

anonymous · Answer

someone help please?