Equilibrium question?

Question

From an equilbrium constant, one can determine:
a. the extent of the reaction
b. the speed of a reaction
c. whether the reaction is endothermic or exothermic

[a] A only
[b] B only
[c] C only
[d] A and C only
[e] A and B only

I know it is not B, and I know it is A, and I'm pretty sure it is A and C, since an endothermic K goes up with higher temps and since and exothermic K goes up with lower temps. However, I'm not sure.

Answer 1

c is not quite true, as K is related to delta G by:

delta G = -RT ln K

and delta G is related to delta H by:

delta G = delta H - T*delta S

So it is possible to have a endothermic reaction have a K value greater than 1 if the entropy component is large enough.

A is true, but B is false, even though K relates to the rate constants of the forward and reverse reactions.

Answer 2

c