Hw question 5J.15


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kennedyp
Posts: 56
Joined: Tue Nov 13, 2018 12:18 am

Hw question 5J.15

Postby kennedyp » Tue Feb 25, 2020 5:36 pm

For the first part of part a , I used the standard gibbs free energy equation and was able to correctly find the first K, but I'm using the Van't Hoff equation to find the second K and I keep getting one. I don't know if the book made the mistake or if I'm doing something wrong in my calculations (the book answer is 1.0 x 10^-7). Here's the question for reference: ( 5J.15 Calculate the equilibrium constant at 25 8C and at 150 8C for each of the following reactions, using data available in Appendix 2A:
(a) NH4Cl(s) ∆ NH3(g) 1 HCl(g) )

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

Re: Hw question 5J.15

Postby Justin Sarquiz 2F » Wed Feb 26, 2020 8:32 am

I found delta G* using delta G*=delta H* - Tdelta S*
You have to solve for delta H* and delta S* and then use those values with the temperatures to find delta G*
deltaG*= -RT ln K
You know everything except for K
Then do this same procedure for the other temperature

rachelle1K
Posts: 109
Joined: Sat Sep 07, 2019 12:16 am

Re: Hw question 5J.15

Postby rachelle1K » Mon Mar 02, 2020 11:40 pm

I was looking at this question in other chemistry posts, and someone said we have to use the equation ln(K2/K1) = (deltaH/R)[(1/T1) - (1/T2)] Though I am not really sure how to apply it.


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