Multiple Choice
Which of the following pairs of formulas contain equal numbers of nitrogen atoms?
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3. Chemical Reactions
Molecular Formula
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How many oxygen atoms are present in one molecule of water (H_2O)?
A
0
B
1
C
2
D
3
Verified step by step guidance1
Identify the chemical formula of the molecule given, which is H_2O for water.
Understand that the subscript number in a chemical formula indicates the number of atoms of that element in one molecule.
Look at the subscript next to oxygen (O) in H_2O. Since there is no subscript explicitly written after O, it means there is exactly one oxygen atom.
Recognize that the subscript '2' after H means there are two hydrogen atoms, but this does not affect the count of oxygen atoms.
Conclude that one molecule of water contains exactly one oxygen atom.
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