Asked by sam

one example has Cl2 ( that is an L)

the other has (OH)2

I still do not understand the difference if it has brackets or does not have brackets around it

Answers

Answered by DrBob222
What's to understand. If brackets (you used parentheses which is the usual way to do it) or parentheses, it means <b> to multiply everything <i>inside</i> the parenthese by the number in the subscript.</b> So.
Mg(OH)2 has 1 Mg atom, 2 O atoms and 2 H atoms.
MgO has 1 Mg atom and 1 O atom.
Al(OH)3 has 1 Al atom, 3 O atoms, and 3 H atoms.
(CN)2 has 2 C atoms and 2 N atoms in the compound cyanogen.
(NH4)2CO3 has 2 N atoms, 8 H atoms, 1 C atom and 3 O atoms in the compound ammonium carbonate.