Multiple Choice
Which of the following is the correct molecular formula for glucose?
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3. Chemical Reactions
Molecular Formula
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How many oxygen atoms are present in one molecule of H_2O?
A
2
B
1
C
0
D
3
Verified step by step guidance1
Identify the chemical formula of the molecule given, which is H_2O. This formula represents water.
Understand that the subscript number following an element symbol indicates the number of atoms of that element in one molecule.
In H_2O, the subscript '2' after H means there are 2 hydrogen atoms, and the absence of a subscript after O means there is 1 oxygen atom.
Therefore, count the oxygen atoms by noting the subscript for O, which is implicitly 1 when no number is shown.
Conclude that one molecule of H_2O contains exactly 1 oxygen atom.
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