Multiple Choice
How many iodine atoms are present in 3 molecules of CI_4?
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3. Chemical Reactions
Molecular Formula
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How many oxygen atoms are present in the chemical formula 2Ca(ClO2)2?
A
6
B
8
C
2
D
4
Verified step by step guidance1
Identify the chemical formula given: 2Ca(ClO2)2. The coefficient 2 in front means there are 2 formula units of Ca(ClO2)2.
Focus on the part inside the parentheses: (ClO2)2. This means there are 2 ClO2 groups in one formula unit.
Determine the number of oxygen atoms in one ClO2 group. Since the subscript 2 is after O, there are 2 oxygen atoms per ClO2 group.
Calculate the total oxygen atoms in one formula unit of Ca(ClO2)2 by multiplying the number of ClO2 groups by the oxygen atoms per group: 2 (ClO2 groups) × 2 (O atoms per group) = 4 oxygen atoms.
Finally, multiply the oxygen atoms per formula unit by the coefficient 2 to account for both formula units: 4 oxygen atoms × 2 = 8 oxygen atoms in total.
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