[sally125]

For a reaction, the equilibrium constant K has the values K = 1.0 x 10^–2 at 100°C and K = 5.0 x 10^2 at 200°C. The value of ?Ho for this reaction is approximately what?

I have absolutely no idea how to do this.  I know how to find the deltaG of each.
Help?

[Hunt]

Pretty straight forward,

ln (K2 / K1 ) = (?H/R) (1/T2 - 1/T1)

This will give you an approximate value of ?H. Make sure you use R=8.314 J/mol.K to obtain ?H in Joules. ( T in Kelvin )