Multiple Choice
Which of the following is the correct chemical formula for phosphorus trichloride?
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3. Chemical Reactions
Naming Molecular Compounds
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What is the correct name for the molecular compound with the formula PI_3?
A
phosphorus iodate
B
phosphoric triiodide
C
phosphorus triiodide
D
triphosphorus iodide
Verified step by step guidance1
Identify the elements present in the compound: P (phosphorus) and I (iodine).
Recognize that this is a molecular (covalent) compound because it is formed between two nonmetals.
Use the appropriate prefixes to indicate the number of atoms of each element: 'tri-' for three iodines and no prefix for one phosphorus (since 'mono-' is usually omitted for the first element).
Combine the element names with the prefixes: 'phosphorus' for P and 'iodide' for I with the prefix 'tri-' to indicate three iodine atoms.
Form the correct name by putting it all together as 'phosphorus triiodide'.
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