Molar and molecular weight of PH3

• Molecular formula: PH3 or H3P
• Relative molecular weight of PH3: 33.997582
• Molar mass of PH3: 33.997582 g/mol (0.034 kg/mol)

Calculation of the relative molecular and molar mass of PH3

• Mr[PH3] = Ar[H] * 3 + Ar[P] = 1.00794 * 3 + 30.973762 = 33.997582
• Molar mass (kg/mol) = Mr[PH3] : 1000 = 33.997582 : 1000 = 0.034 kg/mol

PH3: percent composition by element

• Hydrogen (H) = 3.02382 : 33.997582 * 100 = 8.894 %
• Phosphorus (P) = 30.973762 : 33.997582 * 100 = 91.106 %

Molar mass calculator