To calculate the molecular mass of PCl3 (Phosphorus Trichloride), we need to consider the atomic masses of phosphorus (P) and chlorine (Cl).
The atomic mass of phosphorus (P) is approximately 30.97 amu, and the atomic mass of chlorine (Cl) is approximately 35.45 amu.
PCl3 consists of one phosphorus atom and three chlorine atoms. Therefore, the molecular mass can be calculated as follows:
Molecular Mass of PCl3 = (1 × Atomic Mass of P) + (3 × Atomic Mass of Cl)
Substituting the values:
Molecular Mass of PCl3 = (1 × 30.97 amu) + (3 × 35.45 amu)
Molecular Mass of PCl3 = 30.97 amu + 106.35 amu
Molecular Mass of PCl3 = 137.32 amu
Thus, the molecular mass of PCl3 is 137.32 amu.