## Homework 5G.21

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

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

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

Eileen Si 1G
Posts: 120
Joined: Fri Aug 30, 2019 12:17 am

### Homework 5G.21

For homework problem 5G.21, it asks to calculate the equilibrium constant at 25 C for the following reaction, by using data in Appendix 2A: 2H2(g) + O2(g) = 2H2O(g). I know that you have to use the equation, delta G=-RTlnK in order to solve for equilibrium constant, K, but would delta G be the delta G of the whole reaction or just delta G of 2H2O(g) since this is the final product of the reaction?

Daniel Honeychurch1C
Posts: 109
Joined: Thu Jul 11, 2019 12:15 am

### Re: Homework 5G.21

Delta G is for the whole reaction, which can be calculated using the standard gibbs free energy of formation for the products and reactants.