Multiple Choice
In a pure sample of CH₄, which of the following statements is correct?
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3. Chemical Reactions
Molecular Formula
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Water is composed of H2O molecules. How many total atoms are present in one molecule of water?
A
1
B
3
C
2
D
4
Verified step by step guidance1
Identify the chemical formula of water, which is H\_2O. This tells us the number of each type of atom in one molecule.
Count the number of hydrogen (H) atoms in the formula. The subscript 2 means there are 2 hydrogen atoms.
Count the number of oxygen (O) atoms in the formula. Since there is no subscript after O, it means there is 1 oxygen atom.
Add the number of hydrogen atoms and oxygen atoms together to find the total number of atoms in one molecule of water: total atoms = number of H atoms + number of O atoms.
Express the total number of atoms as 2 (from H) + 1 (from O) = 3 atoms in one molecule of water.
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