Multiple Choice
What is the molar mass of molecular hydrogen (H_2)?
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2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
How many oxygen atoms are present in one formula unit of Mg(OH)_2?
A
1
B
3
C
4
D
2
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Verified step by step guidance1
Identify the chemical formula given: Mg(OH)\_2.
Recognize that the subscript 2 outside the parentheses applies to everything inside the parentheses, meaning there are 2 hydroxide (OH) groups.
Determine the number of oxygen atoms in one hydroxide group (OH), which is 1 oxygen atom.
Multiply the number of oxygen atoms in one hydroxide group by the subscript 2: 1 oxygen atom \(\times\) 2 = 2 oxygen atoms.
Conclude that there are 2 oxygen atoms in one formula unit of Mg(OH)\_2.
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