Posted by Hannah on Sunday, November 20, 2011 at 4:38pm.
No. Don't get carried away with trying to balance the equation by changing the subscripts. In fact, a good rule to remember is this.
1. Write the reactants and products.
SO2 + O2 ==> SO3 (You must have O2 since oxygen is a diatomic molecule. We don't have just O floating around.)
RULE # 2. You may NOT change any subscripts.
3. Balance by changing ONLY the coefficients.
4. 2SO2 + O2 ==> 2SO3
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