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Any subscript tells you the number of atoms in a compound. N subscript 3 means three nitrogen atoms. (OH)2 is two oxygens and two hydrogens. If you have a coefficient like 2 in front of (OH)2, that means you have 4 oxygens and 4 hydrogens.
It counts towards balancing the equation because subscripts display the number of atoms of a particular type. The important thing to remember regarding subscripts is that if you have, for example, (OH)2 where 2 is a subscript, you have 2 O atoms and 2 H atoms. In other words, the subscript 2 is sort of distributed into the parenthesis.
Yes, the subscript does count toward balancing the chemical equations. For example, if you have MgSO4, the subscript is the 4. In this case, the 4 means that there are 4 oxygen atoms. So whenever you have a subscript that comes after an element, it refers to the number of atoms of that element. Another example is 5H20. This means that there are 5 water molecules and each water molecule has 2 hydrogen atoms. Thus, the 5 water molecules have 10 hydrogen atoms (5*2). You must account for these numbers when balancing chemical reactions
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