객관식
How many oxygen atoms are present in one molecule of hydrogen peroxide (H2O2)?
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3. Chemical Reactions
Molecular Formula
Multiple Choice
Which of the following correctly describes the atoms and their quantities in a water (H_2O) molecule?
A
1 hydrogen atom and 1 oxygen atom
B
1 hydrogen atom and 2 oxygen atoms
C
2 hydrogen atoms and 1 oxygen atom
D
2 oxygen atoms and 2 hydrogen atoms
검증된 단계별 안내1
Identify the chemical formula of water, which is H_2O.
Understand that the subscript number in a chemical formula indicates the number of atoms of that element in one molecule.
In H_2O, the subscript '2' after hydrogen (H) means there are 2 hydrogen atoms.
There is no subscript after oxygen (O), which means there is 1 oxygen atom.
Therefore, a water molecule contains 2 hydrogen atoms and 1 oxygen atom.
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