Molar and molecular weight of Si3N4

• Molecular formula: Si3N4 or N4Si3
• Relative molecular weight of Si3N4: 140.2833
• Molar mass of Si3N4: 140.2833 g/mol (0.14028 kg/mol)

Calculation of the relative molecular and molar mass of Si3N4

• Mr[Si3N4] = Ar[N] * 4 + Ar[Si] * 3 = 14.0067 * 4 + 28.0855 * 3 = 140.2833
• Molar mass (kg/mol) = Mr[Si3N4] : 1000 = 140.2833 : 1000 = 0.14028 kg/mol

Si3N4: percent composition by element

• Nitrogen (N) = 56.0268 : 140.2833 * 100 = 39.938 %
• Silicon (Si) = 84.2565 : 140.2833 * 100 = 60.062 %

Molar mass calculator