Multiple Choice
What is the correct name for the molecular compound with the formula NO_2?
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3. Chemical Reactions
Naming Molecular Compounds
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Which of the following is the correct chemical formula for phosphorus trichloride?
A
PCl_5
B
P_3Cl
C
P_2Cl_3
D
PCl_3
Verified step by step guidance1
Understand the naming convention for binary molecular compounds: the prefixes (mono-, di-, tri-, tetra-, penta-, etc.) indicate the number of atoms of each element in the compound.
Identify the elements involved: phosphorus (P) and chlorine (Cl).
Recognize that 'phosphorus trichloride' means one phosphorus atom combined with three chlorine atoms, as indicated by the prefix 'tri-' for chlorine.
Write the chemical formula by placing the symbol for phosphorus first (P) followed by the symbol for chlorine (Cl) with the subscript 3 to indicate three chlorine atoms: \(PCl_3\).
Compare the given options to confirm that \(PCl_3\) matches the correct formula for phosphorus trichloride.
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