A chemist fills a reaction vessel with 0.978 g aluminum hydroxide AlOH3 solid, 0.607 M aluminum Al+3 aqueous solution, and 0.396 M hydroxide OH− aqueous solution at a temperature of 25.0°C. Under these conditions, calculate the reaction free energy ΔG for the following chemical reaction:
Al(OH)3(s) = A1+ (aq) +30H (aq)
Use the thermodynamic information in the ALEKS Data tab. Round your answer to the nearest kilojoule.
KJ

= 168.12 kJ

Explanation: Gibbs Free Energy, at any time, is defined as the enthalpy of the system minus product of temperature and entropy of the reaction, i.e.:

Enthalpy is defined as internal heat existent in the system. It is calculated as:

Using Enthalpy Formation Table:

Entropy is the degree of disorder in the system. It is found by:

Calculating:

And so, Gibbs Free energy will be:

Rounding to the nearest kJ:

= 168.12 kJ

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