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Chemistry(Please help)

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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?

  • Chemistry(Please help) -

    so far so good.

  • Chemistry(Please help) -

    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?

  • Chemistry(Please help) -

    -17200/4157 = ln K

    k = about 0.016 (but not exact).

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