Question Detail
Question
How many atoms are present in one formula unit of magnesium hydroxide, Mg(OH)2?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Mg(OH)2 contains 1 magnesium atom, 2 oxygen atoms (from the OH groups), and 2 hydrogen atoms. The total number of atoms is 1 + 2 + 2 = 5.
Hint
Remember that the subscript outside the parentheses multiplies every atom inside.