Multiple Choice
Which of the following is the correct chemical formula for chlorine dioxide?
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3. Chemical Reactions
Naming Molecular Compounds
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Which of the following is the correct chemical formula for diarsenic pentoxide?
A
As5O2
B
As2O5
C
Ar2O5
D
2As5O
Verified step by step guidance1
Identify the prefixes in the name 'diarsenic pentoxide': 'di-' means 2 atoms of arsenic (As), and 'pent-' means 5 atoms of oxygen (O).
Write the formula by combining the number of atoms indicated by the prefixes: 2 arsenic atoms and 5 oxygen atoms, which gives As2O5.
Check the options given and compare them with the formula derived: As5O2, As2O5, Ar2O5, and 2As5O.
Eliminate incorrect options by verifying the element symbols and the number of atoms: 'Ar' is argon, not arsenic, so Ar2O5 is incorrect; 2As5O is not a proper formula notation; As5O2 reverses the numbers.
Confirm that the correct chemical formula for diarsenic pentoxide is As2O5, matching the number of atoms indicated by the prefixes.
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