Multiple Choice
Which of the following correctly describes the atoms and their quantities in a water (H_2O) molecule?
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3. Chemical Reactions
Molecular Formula
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Which of the following pairs of formulas contain equal numbers of nitrogen atoms?
A
N2 and N2O
B
NO2 and N2O
C
NH3 and NO2
D
NH3 and N2O
Verified step by step guidance1
Identify the number of nitrogen atoms in each chemical formula by examining the subscript next to the nitrogen (N) symbol. If there is no subscript, it means there is one nitrogen atom.
For N2, note that the subscript 2 indicates there are 2 nitrogen atoms.
For N2O, the subscript 2 next to N means there are 2 nitrogen atoms, and the O represents oxygen atoms, which we do not count for nitrogen comparison.
For NO2, there is no subscript next to N, so there is 1 nitrogen atom; the subscript 2 applies to oxygen atoms.
For NH3, there is 1 nitrogen atom (no subscript), and the subscript 3 applies to hydrogen atoms.
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