Thermodynamics Solutions: #7

7.* (1996 F 11B) Write a balanced equation for the decomposition of ozone. What is the sign of DG, DH, and DS?

This reaction forms 3 molecules of gas from 2 molecules, so DS is positive.

It's not immediately obvious, but this is exothermic (DH is negative.).

This guarantees that DG=DH-TDS is negative.