Question Detail
Question
How many atoms are present in a stable molecule of calcium dihydrogen phosphate, which has the formula Ca(H2PO4)2?
Correct Answer
Option D is the correct answer.
Detailed Explanation
The formula Ca(H2PO4)2 contains 1 Ca atom, and inside the parentheses: 2 H atoms, 1 P atom, and 4 O atoms. The subscript '2' outside multiplies these: (H2PO4)2 gives 22=4 H atoms, 21=2 P atoms, and 2*4=8 O atoms. Total atoms = 1 Ca + 4 H + 2 P + 8 O = 15 atoms.
Hint
Multiply the atoms inside the parentheses by the subscript outside, then add all atoms.