Chemistry
Grade-9
Easy
Question
How many atoms of oxygen are in a molecule of Ca3(PO4)2?
- 1
- 2
- 4
- 8
Hint:
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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