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# Four moles of an ideal gas expand isothermally from 1 litre to 10 litres at

Four moles of an ideal gas expand isothermally from 1 litre to 10 litres at 300K. Calculate the change in free energy of the gas. (R = 8.314 JK–1 mol–1 ).

$(\Delta G)_T=2.303 nRT\log(\large\frac{V1}{V2})$
$(\Delta G)_T = 2.303\times 4\times 8.314 \times 300 log(\large\frac{1}{10})$
$(\Delta G)_T = -22.97kJ$