Multiple Choice
Given that the compound XCl₄ contains 66.1% Cl by mass, what is the atomic mass of element X?
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3. Chemical Reactions
Molecular Formula
Multiple Choice
How many hydrogen and oxygen atoms are present in a single molecule of water (H_2O)?
A
1 hydrogen atom and 1 oxygen atom
B
1 hydrogen atom and 2 oxygen atoms
C
2 hydrogen atoms and 2 oxygen atoms
D
2 hydrogen atoms and 1 oxygen atom
Verified step by step guidance1
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 H means there are 2 hydrogen atoms.
There is no subscript after O, which means there is 1 oxygen atom in the molecule.
Therefore, a single molecule of water contains 2 hydrogen atoms and 1 oxygen atom.
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