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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: samuelima10 on December 09, 2020, 10:28:54 PM

Title: Demonstration of formula with Kx
Post by: samuelima10 on December 09, 2020, 10:28:54 PM

(https://chemical189211630.files.wordpress.com/2020/12/aa.png?w=750)


please help me demonstrate this equation

Title: Re: Demonstration of formula with Kx
Post by: billnotgatez on December 10, 2020, 01:26:41 AM

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Title: Re: Demonstration of formula with Kx
Post by: samuelima10 on December 10, 2020, 07:22:48 AM

sorry, I really hadn't read the rules.
but I was trying to solve the same thing as if it would solve van't Hoff's equation replacing Kp with Kx
Kp = Kx . (P/Po) ^Δn
ΔG = -R. T. ln kx. (P/Po)^Δn
Ln Kx = AG /-RT . (Po/P)^Δn

my problem is when applying the derivative, i have great difficulties in calculating

Title: Re: Demonstration of formula with Kx
Post by: mjc123 on December 10, 2020, 08:32:23 AM

The last step is wrong. You should have written (for clarity)
ΔG° = -RT.ln{K_x.(P/P₀)^Δn} = RT{lnK_x + Δn.ln(P/P₀)}