@Bowei: Mr. Kane is throwing out a trick question by having us trying to balance the chemical equation "water + sulfur dioxide = sulfuric acid". Impossible since he didn't give us a missing factor (oxygen double bonded to himself) because IIRC sulfuric acid is a combination of H2O (sorry about no subscripts) and SO3 (sulfur trioxide) which gives you one sulfuric acid molecule in the form of a gas which eventually condensates. HORRIBLE!
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