Multiple Choice
A 48.3 g sample of an aluminum iodine compound contains 3.2 g of aluminum. What is the empirical formula for the compound?
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3. Chemical Reactions
Empirical Formula
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In the chemical formula P2O5, how many atoms of each element are present?
A
5 phosphorus atoms and 2 oxygen atoms
B
1 phosphorus atom and 5 oxygen atoms
C
2 phosphorus atoms and 5 oxygen atoms
D
2 phosphorus atoms and 1 oxygen atom
Verified step by step guidance1
Identify the chemical formula given: P2O5.
Understand that the subscript numbers in a chemical formula indicate the number of atoms of each element present in one molecule of the compound.
Look at the subscript next to phosphorus (P), which is 2, meaning there are 2 phosphorus atoms.
Look at the subscript next to oxygen (O), which is 5, meaning there are 5 oxygen atoms.
Conclude that the formula P2O5 contains 2 phosphorus atoms and 5 oxygen atoms.
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