Final answer:
The name for the chemical formula N2S5 · 3H2O is dinitrogen pentasulfide trihydrate, which is option D, reflecting the number of nitrogen, sulfur, and water molecules in the compound.
Step-by-step explanation:
The correct name for the chemical formula N2S5 · 3H2O is dinitrogen pentasulfide trihydrate. The prefix 'di-' indicates two nitrogen atoms, 'penta-' indicates five sulfur atoms, and 'trihydrate' reflects the presence of three water molecules associated with each formula unit of the compound.
When naming compounds that consist of nonmetals, numerical prefixes are used to indicate the number of atoms of each element in the compound. In the case of hydrates, the number of water molecules is indicated using similar prefixes. For example, CuSO4·5H2O is named copper(II) sulfate pentahydrate because it has five water units per formula unit of copper(II) sulfate.