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Sulfurous acid, H2SO3, breaks down into water (H2O) and sulfur dioxide (SO2).

If only one molecule of sulfurous acid was involved in a chemical reaction, how many sulfur (S) atoms would be in the products?


1 atom of sulfur
2 atoms of sulfur
3 atoms of sulfur
No atoms of sulfur would be present.

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Answer:

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The answer is A

Explanation:

There would be one sulfur atom in the products.  

• Based on the reaction: H2SO3 ⇔ H2O + SO2

• The number of atoms on the reactant sides is 2 atoms of hydrogen, 1 atom of sulfur, and 3 atoms of oxygen.  

• The number of atoms on the product side is 2 atoms of hydrogen, one atom of sulfur, and three atoms of oxygen.  

• It can be seen that the equation is balanced as atoms on both the reactants and products side are the same.  

Thus, it can be stated that there is one atom of sulfur in the products.  

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