Homework Help: chem

Posted by jj on Tuesday, May 31, 2011 at 10:53pm.

In an equilibrium mixture of HCl, Cl2 and H2, the partial pressure of H2 is 4.2 mPa and that of Cl2 is 8.3 mPa. What is the partial pressure of HCl at 500 oK given that at that temperature Kp = 4.0 x 1018 for
H2(g)+ Cl2(g)--> 2HCl(g)

chem - jj, Tuesday, May 31, 2011 at 10:55pm
*** I meant Kp = 4.0 x 10^18
chem - DrBob222, Tuesday, May 31, 2011 at 11:26pm
If Kp = 4.0E18 = (HCl)^2/(H2)(Cl2)
Isn't this just a matter of substituting values for (H2) and (Cl2) and solving for (HCl)? Or is it more complicated than that.
chem - jj, Tuesday, May 31, 2011 at 11:53pm
yes i did that but the answer i get is weird
chem - DrBob222, Wednesday, June 1, 2011 at 12:07am
True you obtained a huge number for (HCl); however, with a K as large as 10^18 you know (HCl) must be very very large.
chem - xx, Wednesday, June 1, 2011 at 1:48am
Is 8.35 x 10^9mPa the right answer?
chem - jj, Wednesday, June 1, 2011 at 2:08am
I don't know
chem - jj, Wednesday, June 1, 2011 at 2:09am
@DrBob222: is that the answer?

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