## Standard Gibbs

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

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

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

Justin Bui 2L
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am

### Standard Gibbs

Can someone give me a concise explanation of what standard means? Or when Delta G has that little degree sign following it. This also shows up in other formulas.

Harjas Sabharwal 1G
Posts: 42
Joined: Sat Jul 22, 2017 3:01 am

### Re: Standard Gibbs

I'm pretty sure that standard refers to the standard state of the molecule (Ex: gas, liquid or solid). It is also at 273.15K and 1 atm pressure.

Seth_Evasco1L
Posts: 54
Joined: Thu Jul 27, 2017 3:00 am

### Re: Standard Gibbs

Standard just indicates that all reactants and products are in their standard state.

Standard state for a gas is 1 atm. Standard state for a solution is 1M at 1 atm. Standard state for an element is the most stable phase (solid, liquid, gas) at 1 atm and temperature of interest (250C).

Rishi Khettry 1L
Posts: 29
Joined: Fri Sep 29, 2017 7:05 am

### Re: Standard Gibbs

The sign indicates standard state which means it is taking place under standard conditions (aka 25 degrees Celsius and 1 atm)