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What do parentheses around a group of atoms in a chemical formula indicate?
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What do parentheses around a group of atoms in a chemical formula indicate?

User Fiffy
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Lets look at the example
Cu(SO4)2
SO4 means 1 atom of S and 4 atoms of O

(SO4)2 means 2*1 atom of S and 2*4 atoms of O, so we get
2 atoms of S and 8 atoms of O.

User Jammin
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