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Sulfuric acid is a component of acid rain formed when gaseous sulfur dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous sulfuric acid. Write a balanced chemical equation for this reaction .

Solution:

If the question says solid, we need to write (s) next to the compound, liquid means (l), gaseous means (g) and aqueous means (aq).
Gaseous sulfur dioxide is SO2(g) (prefixes signify the number of atoms in molecular compounds). Gaseous oxygen is O2(g). Oxygen is a diatomic gas and that is why it has a subscript of 2. You can memorize all the diatomic gases with BrINCl HOF mnemonic. Liquid water is H2O(l). Aqueous sulfuric acid is H2SO4(aq)

The equation is: SO2(g) + O2(g) + H2O(l)—> H2SO4(aq)
Now lets balance it : 2SO2(g) + O2(g) + 2H2O(l)—> 2H2SO4(aq)

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