Answer: H2SO3 This problem addresses the nomenclature of oxyacids. Sulfurous acid is related to the sulfite ion, SO32-. In the context of the question, there is only one compound that contains this structure. Thus, the molecular formula for sulfurous acid is H2SO3.

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AP Chemistry Exam Prep

Category - AP Chemistry

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Which of the following is the correct molecular formula for sulfurous acid?

SO₄^2-
H₂SO₃
H₂SO₄
H₂S
HS^-

Explanation

Answer: H₂SO₃

This problem addresses the nomenclature of oxyacids. Sulfurous acid is related to the sulfite ion, SO₃^2-. In the context of the question, there is only one compound that contains this structure. Thus, the molecular formula for sulfurous acid is H₂SO₃.

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