Multiple Choice
What is the molar mass of molecular hydrogen (H_2)?
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- 1. Intro to General Chemistry3h 48m
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2. Atoms & Elements
Calculating Molar Mass
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many oxygen atoms are present in one formula unit of Mg(OH)_2?
A
1
B
3
C
4
D
2
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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