## 5G.21

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

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

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

AlyssaYeh_1B
Posts: 100
Joined: Sat Aug 17, 2019 12:16 am

### 5G.21

Calculate the equilibrium constant at 25C for each of the following reactions, by using data in Appendix 2A:
(a) the combustion of hydrogen: 2H2(g) + O2(g) <--> 2H2O(g)
(b) the oxidation of carbon monoxide: 2CO(g) +O2(g) <--> 2CO2 g)
(c) the decomposition of limestone: CaCO3(s) <--> CaO(s) + CO2(g)

What do I need to do after I calculate the delta G values for these reactions?

Shivam Rana 1D
Posts: 106
Joined: Fri Aug 09, 2019 12:16 am

### Re: 5G.21

You can find the K using the delta g value and the delta G0 value. The van't hoff equation may help.

nehashetty_2G
Posts: 102
Joined: Thu Jul 25, 2019 12:15 am

### Re: 5G.21

I would use the equation: G=-RTlnK. You calculate G using appendix 2A, and solve for K.