Question 3 • AA-F26 Physical Science
Each ClO₂ group contains 2 oxygen atoms. The subscript 2 outside the parentheses means there are 2 ClO₂ groups in each Ca(ClO₂)₂ unit, giving 2 × 2 = 4 oxygen atoms per unit. The coefficient 2 means there are 2 units, so 2 × 4 = 8 oxygen atoms total. The correct choice is D, 8.
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