The brown color associated with photochemical smog is due to NO2(g). This is involved with the following equilibrium in the atmosphere: 2 NO2(g) N2O4. Predict the signs of the enthalpy and entropy changes for this reaction.

Question

The brown color associated with photochemical smog is due to NO2(g). This is involved with the following equilibrium in the atmosphere: 2 NO2(g) <===> N2O4. Predict the signs of the enthalpy and entropy changes for this reaction.

If the equation is at equilibrium should DH and DS be 0?

DrBob222 · Answer

Delta G is zero for a reaction at equilibrium.

Ginger · Answer

I understand that, but the question is asking about DH and DS, so can DS and DH not be determined as positive, negative, or 0 by that equation?