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    Chemistry
    Grade-9
    Easy

    Question

    How many atoms of oxygen are in a molecule of Ca3(PO4)2?

    1. 1
    2. 2
    3. 4
    4. 8

    hintHint:

    To get the total number of each atom multiply the subscripts.

    The correct answer is: 8

      • In the chemical formula, Greek parentheses represent the number of polyatomic subgroups present.
      • In Ca3(PO4)2 two phosphate molecules are present.
      • In each phosphate molecule, four oxygen atoms are present. In two phosphate total of eight oxygen atoms are present.

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