## How to approach 9.53

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

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

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

Fenared Ortiz 3K
Posts: 37
Joined: Wed Nov 16, 2016 3:03 am

### How to approach 9.53

Calculate the change in molar Gibbs free energy for the process NH3(l) S NH3(g) at 1 atm and (a) 15.0 C; (b) 45. C (see Tables 8.3 and 9.1). In each case, indicate whether vaporization would be spontaneous.

Are we supposed to use the delta G = delta H - T * delta S
if so which delta H and which delta S should be used?

Janine Chan 2K
Posts: 71
Joined: Fri Sep 29, 2017 7:04 am

### Re: How to approach 9.53

Yes, we are supposed to use the equation ∆G = ∆Hvap - T∆Svap. We use the vaporation values because NH3 is going from a liquid to a gas.

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