Calculations using the Van't Hoff Equation

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

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

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

josephyim1L
Posts: 61
Joined: Fri Sep 28, 2018 12:15 am

Calculations using the Van't Hoff Equation

What are the different applications of the Van't Hoff Equation?

Example from the homework:
11.15 (a) Calculate the reaction Gibbs free energy of I2(g) S 2 I(g) at 1200. K (K = 6.8) when the partial pressures of I2 and I are 0.13 bar and 0.98 bar, respectively. (b) What is the spontaneous direction of the reaction? Explain briefly.

Carissa Young 1K
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

Re: Calculations using the Van't Hoff Equation

For that problem I used deltaG= deltaGo + RTlnQ which further is deltaG=-RTlnK + RTlnQ. I don't know really what the applications of the Van't Hoff equation.

Manu Vohra 1L
Posts: 61
Joined: Wed Oct 03, 2018 12:15 am

Re: Calculations using the Van't Hoff Equation

This problem would not require the Van't Hoff equation. An instance where you would need to use the Van't Hoff equation would be if you were looking to find a K value at a given temperature T2 (you would have to be given K at another temperature as well to use as K1 and T1 in the equation).