Question

Find the standard Gibbs energy charge for reaction

A) CaCO3(s) → CaO(s) + CO2(g)

The ΔGf° values for the three components of this reaction system are CaCO3(s): –1128 kJ mol–1; CaO(s): –603.5 kJ/mol; CO2(g): –137.2 kJ/mol.

Answer 1

The standard Gibbs energy change for reaction is equal to

$\Delta G_0 (reaction) = \sum n\Delta G_0(products) - \sum m\Delta G_0(reactants)$, where n, m -- quantity of moles of each compound.

$\Delta G_0 (reaction) = (-603.5 - 137.2) - (-1128) = 387.3 (kJ/mol)$

Answer: 387.3 kJ/mol is the standard Gibbs energy change of the reaction.