Chemistry(Please help)
posted by Hannah .
1) Nitrosyl chloride (NOCl) decomposes at high temperature. The equation is
2 NOCl (g) > 2 NO (g) + Cl2 (g) at 227oC
Using delta Ho = 81.2 kJ and delta So = 128 J/K, calculate the value of the equilibrium constant for this reaction.
I do not know how to start this problem or what formula I should use.
Chemistry(Please help)  DrBob222, Monday, April 23, 2012 at 7:50pm
dGo = dHo  TdSo
Then dGo = RTlnK
So for delta G= delta H  T delta S it would be delta G= 81200 J/K  500K(128J/k)
This would equal 17200. Did I do this correctly so far before I move on?

so far so good.

Now I do delta G = RT lnK
So 17200 = 8.314(500) lnk
17200 = 4157 ln k
This is where I am not sure what to do next do I add 4157 to the left side and then take the ln? 
17200/4157 = ln K
k = about 0.016 (but not exact).