Question

Using the thermodynamic information in the ALEKS Data tab, calculate the standard reaction free energy of the following chemical reaction: →2NOClg+2NOgCl2g Round your answer to zero decimal places.

Answer 1

Solution:

The Reaction given here is:

2NOCl(g) -----> 2NO(g) + Cl2(g).

The Gibbs Free Energy of Formation (∆G°f) of the Reactant and Products as per Aleks Data Tab are as follows:

i) ∆G°f of NO = 87.6 KJ/mol.

ii) ∆G°f of Cl2 = 0 (since Homonuclear Bimolecular Gas)

iii) ∆G°f of NOCl = 66.07 KJ/mol.

The Standard Gibbs Free Energy of a Reaction is the Sum of Individual Free Energy of Formation of Products - Sum of Individual Free Energy Change of Reactants.

i.e; ∆G°rxn = £∆G°f of Products - £ ∆G°f of Reactants.

Therefore ∆G°rxn (in KJ/mol) = {2×87.6+1×0} - 66.07 KJ/mol.

= 109.13 = 109 KJ/mol.

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