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QUESTION

What do parentheses mean in chemical formulas?

It indicates that there are a certain number of atoms in a compound.

For example:

##Al_2(SO_4)_3##

This shows that there are three times the number of atoms which are in the brackets:

S - 1 x 3 = 3 atoms O - 4 x 3 = 12 atoms

Hope this helps!

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