Question

which formula represents the compound commonly known as phosphine with iupac name phosphorus trihydride?
○ ph
○ ph2
○ ph3
○ ph4

Explanation:

The IUPAC name "phosphorus trihydride" indicates 1 phosphorus (P) atom and 3 hydrogen (H) atoms (the prefix "tri-" means three). This matches the formula PH₃, which is the chemical formula for phosphine.

Answer:

PH3