The temperature reaction changes from spontaneous to nonspontaneous?

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

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

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

Kassidy Tran 1E
Posts: 77
Joined: Fri Sep 28, 2018 12:15 am

The temperature reaction changes from spontaneous to nonspontaneous?

How do you calculate the temperature a reaction changes from non-spontaneous to spontaneous? Is it at the point where the reaction reaches equilibrium?

904936893
Posts: 62
Joined: Fri Sep 28, 2018 12:29 am

Re: The temperature reaction changes from spontaneous to nonspontaneous?

You use the equation delta G = delta H - Tdelta S, and by plugging in your known values of delta H and S, you make G equal to zero and solve for T. That temperature, T (when G = 0) is when the reaction changes from nonspontaneous to spontaneous and vice versa.