Multiple Choice
Which of the following is the correct chemical formula for nitrogen trihydride?
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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 P_2O_5?
A
Phosphorus oxide
B
Diphosphorus pentaoxide
C
Phosphoric acid
D
Diphosphorus pentoxide
Verified step by step guidance1
Identify the elements present in the molecular formula P_2O_5: phosphorus (P) and oxygen (O).
Recognize that this is a molecular compound composed of nonmetals, so we use prefixes to indicate the number of atoms of each element.
Use the prefix 'di-' for 2 phosphorus atoms and 'penta-' for 5 oxygen atoms.
Combine the prefixes with the element names: 'diphosphorus' for P_2 and 'pentoxide' for O_5 (note that 'oxide' is used for oxygen in binary compounds).
Put the name together as 'diphosphorus pentoxide' to correctly name the compound P_2O_5.
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