Posted by **sam** on Friday, November 2, 2007 at 9:29pm.

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

- science -
**DrBob222**, Friday, November 2, 2007 at 9:44pm
What's to understand. If brackets (you used parentheses which is the usual way to do it) or parentheses, it means ** to multiply everything ***inside* the parenthese by the number in the subscript. 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.

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