To find the number of atoms in Ca(OH)2 (Calcium hyroxide ) we’ll add up the number of atoms for Ca, O, and H. The small number after the element symbol is called the subscript and this tells us how many of that atom are in the compound. When there is no number after an element, as is the case with Calcium (Ca), we assume there to be one atom of that element. For example, in Ca(OH)2 we have only one Ca atom.
For Ca(OH)2 there are a total of 5 atoms in the compound.
To find the number of atoms in one mole of Ca(OH)2 we multiply the number of each atom (for example there are two oxygen atoms) by Avogadro's number, 6.02 x 10^23.
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