1) Nitrosyl chloride (NOCl) decomposes at high temperature. The equation is

Question

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?

Answer 1

so far so good.

Answer 2

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?

Answer 3

-17200/4157 = ln K

k = about 0.016 (but not exact).