Multiple Choice
Which of the following is the correct chemical formula for tetrasulfur pentoxide?
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3. Chemical Reactions
Naming Molecular Compounds
Multiple Choice
What is the correct name for the molecular compound with the formula As2O5?
A
diarsenic pentoxide
B
diarsenic pentaoxide
C
arsenic(V) oxide
D
arsenic pentoxide
Verified step by step guidance1
Identify that the compound As2O5 is a molecular (covalent) compound composed of nonmetals arsenic (As) and oxygen (O).
Recall the naming rules for molecular compounds: use prefixes to indicate the number of atoms of each element (di-, tri-, tetra-, penta-, etc.) and name the second element with an '-ide' suffix.
Determine the number of atoms of each element in the formula: 2 arsenic atoms and 5 oxygen atoms.
Apply the appropriate prefixes: 'di-' for 2 arsenic atoms and 'penta-' for 5 oxygen atoms, and name oxygen as 'oxide'.
Combine the parts to form the name: 'diarsenic pentoxide'. Note that 'pentaoxide' is incorrect because the 'a' is dropped before 'oxide' for easier pronunciation.
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