When Magnesium Sulfite Decomposes, the Solid Transforms into Magnesium Oxide

question 8

Multiple Choice

When magnesium sulfite decomposes, the solid transforms into magnesium oxide and sulfur dioxide.
MgSO₃( s ) → MgO( s ) + SO₂( g )
At what temperature will this reaction be spontaneous according to Gibb's Energy?
Δ G in kJ/mol for: MgSO₃( s ) = − 1172, MgO( s ) = − 569.6, SO₂( g ) = − 300.2
Δ H in kJ/mol for: MgSO₃( s ) = − 1068, MgO( s ) = − 601.8, SO₂( g ) = − 296.8
Δ S in J/mol K for: MgSO₃( s ) = 121, MgO( s ) = 27, SO₂( g ) = 248.1

• A) temps below − 63.1 K
• B) temps below 179.5 K
• C) temps below 415.8 K
• D) temps above 1100 K

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