Molar and molecular weight of As2Se

• Relative molecular weight of As2Se: 228.8032
• Molar mass of As2Se: 228.8032 g/mol (0.2288 kg/mol)

Calculation of the relative molecular and molar mass of As2Se

• Mr[As2Se] = Ar[As] * 2 + Ar[Se] = 74.9216 * 2 + 78.96 = 228.8032
• Molar mass (kg/mol) = Mr[As2Se] : 1000 = 228.8032 : 1000 = 0.2288 kg/mol

As2Se: percent composition by element

• Arsenic (As) = 149.8432 : 228.8032 * 100 = 65.49 %
• Selenium (Se) = 78.96 : 228.8032 * 100 = 34.51 %

Molar mass calculator