Gibbs free energy and entropy

Entropy

A measure of disorder within a substance

What 3 things affect a substances entropy?

1. Temperature

2. State

3. Moles

What is the equation for Gibbs free energy?

\Delta G=\Delta H-T\Delta S

How do you find the temperature for a reaction to be feasible?

By putting \Delta G=0

In order for a reaction to be feasible Gibbs free energy must be…

The value must be 0 or negative

Complete this table for the results of increasing the temperatures with different positive and negative values of Enthalpy and entropy and if the reaction is feasible

Rearrange the Gibbs free energy equation to y=mx+c

\Delta G=-\Delta S\times T+\Delta H

What is the equation to calculate gradient

m=\frac{\Delta y}{\Delta x}

If the gradient is 0.1647 kJ K-1 mol-1 find out what the entropy is in J K-1 mol-1

m=-\Delta S

\Delta S=-m

=-0.1647 convert to kJ to J

=-164.7 J