When Magnesium Sulfite Decomposes, the Solid Transforms into Magnesium Oxide

question 7

Multiple Choice

When magnesium sulfite decomposes, the solid transforms into magnesium oxide and sulfur dioxide. The reaction is as follows:
MgSO ₃ ( s ) → MgO( s ) + SO ₂ ( g )
According to the Gibbs free energy, at what temperature will this reaction be spontaneous?
Δ G in kJ\moles for MgSO ₃ ( s ) is − 1172, for MgO( s ) is − 569.6, and for SO ₂ ( g ) is − 300.2. Δ H in kJ\moles for MgSO ₃ ( s ) is − 1068, for MgO( s ) is − 601.8, and for SO ₂ ( g ) is − 296.8. Δ S in J\moles K for MgSO ₃ ( s ) is 121, for MgO( s ) is 27, and for SO ₂ ( g ) is 248.1.

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

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