Molar and molecular weight of Mg3As2

• Relative molecular weight of Mg3As2: 222.7582
• Molar mass of Mg3As2: 222.7582 g/mol (0.22276 kg/mol)

Calculation of the relative molecular and molar mass of Mg3As2

• Mr[Mg3As2] = Ar[Mg] * 3 + Ar[As] * 2 = 24.305 * 3 + 74.9216 * 2 = 222.7582
• Molar mass (kg/mol) = Mr[Mg3As2] : 1000 = 222.7582 : 1000 = 0.22276 kg/mol

Mg3As2: percent composition by element

• Magnesium (Mg) = 72.915 : 222.7582 * 100 = 32.733 %
• Arsenic (As) = 149.8432 : 222.7582 * 100 = 67.267 %

Molar mass calculator