## 4J.5) 7th edition of the textbook

$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$

Katie Frei 1L
Posts: 64
Joined: Fri Sep 28, 2018 12:27 am

### 4J.5) 7th edition of the textbook

For question 4J.5) of the 7th edition of the textbook, after finding the standard enthalpy and standard entropy you can calculate the standard Gibbs free energy. The solutions manual does this by using the temperature of 298K. When can you assume the temperature to be 298K?

Manya Bali 4E
Posts: 66
Joined: Fri Sep 28, 2018 12:23 am

### Re: 4J.5) 7th edition of the textbook

Standard enthalpy and standard entropy (unless otherwise noted) are calculated under the standard temperature condition of 25 degrees celsius or 298K. So if you're using these values and the problem does not specify a temperature, you can assume it is 298K.

Sam Joslyn 1G
Posts: 34
Joined: Fri Sep 28, 2018 12:20 am

### Re: 4J.5) 7th edition of the textbook

All of the values in the Appendix actually depend on the temperature being 298K as this is the standard temperature used in chemistry (my TA called it "the scientific room temperature")