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What is the theoretical percent by mass of magnesium in magnesium oxide (MgO)?
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2. Atoms & Elements
Calculating Molar Mass
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How many oxygen atoms are present in one formula unit of the compound Ba(OH)_2?
A
4
B
1
C
3
D
2
Guida verificata passo dopo passo1
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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