Multiple Choice
Which of the following molecular formulas is also an empirical formula?
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3. Chemical Reactions
Empirical Formula
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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 Al_2(SO_4)_3?
A
6
B
12
C
8
D
4
Verified step by step guidance1
Identify the chemical formula given: Al_2(SO_4)_3. This represents one formula unit of aluminum sulfate.
Focus on the polyatomic ion part: (SO_4)_3 means there are 3 sulfate ions, and each sulfate ion (SO_4) contains 4 oxygen atoms.
Calculate the total number of oxygen atoms by multiplying the number of sulfate ions by the number of oxygen atoms in each sulfate ion: 3 \times 4.
Perform the multiplication to find the total oxygen atoms in one formula unit: 3 \times 4 = 12 oxygen atoms.
Conclude that one formula unit of Al_2(SO_4)_3 contains 12 oxygen atoms.
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