Chemical Forums

Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: _cheers on April 16, 2007, 08:14:43 PM

Title: Kp
Post by: _cheers on April 16, 2007, 08:14:43 PM
Suppose Kp is 81 at some temperature. In one experiment, the flask was charged with initial pressure, P atm, of PCl5 (no other gases) and equil established. What would the pressure have to be in order to make 10% of PCl5 decompose?

PCl3 + Cl2 <----> PCl5  (all gaseous)

HELP??? Ice table? can I make any assumptions? Sorry, I dont even know where to start!
Title: Re: Kp
Post by: Yggdrasil on April 16, 2007, 10:27:39 PM
In terms of the original amount of PCl5, how much products and reactants would you have at equilibrium if 10% of the PCl5 were to decompose?
Title: Re: Kp
Post by: _cheers on April 17, 2007, 01:59:34 AM
Well, I'd have 90% PCl5, and 10% products?
Title: Re: Kp
Post by: Yggdrasil on April 17, 2007, 03:40:42 AM
And how would that look if you plugged it into the equation for Kp?
Title: Re: Kp
Post by: _cheers on April 17, 2007, 01:43:13 PM
hmmm...I'll get back to you on that  ;D