Multiple Choice
What is the theoretical percent by mass of magnesium in magnesium oxide (MgO)?
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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 the compound Ba(OH)_2?
A
4
B
1
C
3
D
2
Verified step by step guidance1
Identify the chemical formula given: Ba(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 per OH group.
Multiply the number of oxygen atoms in one OH group by the subscript 2 to find the total oxygen atoms: 1 oxygen atom \times 2 = 2 oxygen atoms.
Conclude that there are 2 oxygen atoms in one formula unit of Ba(OH)\_2.
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