# How can I calculate Gibbs free energy at different temperatures?

Mar 7, 2015

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

For a particular value of T one can calculate the Gibbs free energy using the above formula.
H=Enthalpy
S=Entropy
The formula can be modified in accordance with the type of data given.
$H = U + P V$
$H = {q}_{r e v} + w + P V$
$\Rightarrow \Delta H = T \Delta S - P \Delta V + \left(P \Delta V + V \Delta P + \Delta P \Delta V\right)$
$\Rightarrow \Delta G = V \Delta P + \Delta P \Delta V - S \Delta T$