Multiple Choice
What is the total number of carbon atoms in a molecule of ethanoic acid (CH3COOH)?
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3. Chemical Reactions
Molecular Formula
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In the molecular formula for water, H2O, what does the subscript '2' indicate?
A
The molecule has a charge of 2-
B
There are two hydrogen atoms in each molecule of water.
C
The molecule contains two water molecules.
D
There are two oxygen atoms in each molecule of water.
Verified step by step guidance1
Identify the molecular formula given: H2O.
Understand that in a molecular formula, the subscript number following an element symbol indicates the number of atoms of that element in one molecule.
Look at the subscript '2' that follows the hydrogen (H) symbol in H2O.
Interpret this subscript '2' as meaning there are two hydrogen atoms in each molecule of water.
Recognize that the absence of a subscript after oxygen (O) implies there is one oxygen atom in each molecule of water.
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