Multiple Choice
Which of the following is the correct molecular formula for propane?
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3. Chemical Reactions
Molecular Formula
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How many hydrogen atoms are present in one molecule of water (H_2O)?
A
4
B
2
C
3
D
1
Verified step by step guidance1
Identify the chemical formula of the molecule given, which is water (H_2O).
Understand that the subscript number after an element symbol indicates the number of atoms of that element in one molecule.
Look at the subscript for hydrogen (H) in H_2O, which is 2, meaning there are 2 hydrogen atoms in one molecule of water.
Note that the subscript for oxygen (O) is 1, but since it is not written explicitly, it is understood to be 1 atom of oxygen.
Conclude that the number of hydrogen atoms in one molecule of water is 2.
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