Problem: Calculate the standard entropy change for the reaction2Mg(s) + O2(g) → 2MgO(s)using the data from the following table: Substance ?H?f (kJ/mol)?G?f (kJ/mol)S? [J/(K?mol)]Mg(s)0.000.0032.70O2(g)0.000.00205.0MgO(s)-602.0-569.627.00Express your answer to four significant figures and include the appropriate units.

FREE Expert Solution

We’re being asked to determine the Standard entropy change for the given reaction:


2 Mg(s) + O2(g) → 2 MgO(s)

We can use the following equation to solve for ΔS˚rxn:


ΔS°rxn=S°f, prod-S°f, react


Note that we need to multiply each S˚ by the stoichiometric coefficient since S˚ is in J/mol • K.


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Problem Details

Calculate the standard entropy change for the reaction

2Mg(s) + O2(g) → 2MgO(s)

using the data from the following table:

 Substance ?H?f (kJ/mol)?G?f (kJ/mol)S? [J/(K?mol)]
Mg(s)0.000.0032.70
O2(g)0.000.00205.0
MgO(s)-602.0-569.627.00

Express your answer to four significant figures and include the appropriate units.

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