Multiple Choice
Which of the following is the correct molecular formula for calcium carbonate?
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3. Chemical Reactions
Molecular Formula
Multiple Choice
How many hydrogen atoms are present in a molecule of water (H_2O)?
A
3
B
4
C
2
D
1
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Verified step by step guidance1
Identify the chemical formula of the molecule given, which is water (H_2O).
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 hydrogen (H) in H_2O, which is 2, meaning there are 2 hydrogen atoms in one molecule of water.
Recognize that the oxygen (O) atom has no subscript, which implies there is 1 oxygen atom in the molecule.
Conclude that the number of hydrogen atoms in one molecule of water is 2.
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