Molar and molecular weight of Cr2Se3

• Relative molecular weight of Cr2Se3: 340.8722
• Molar mass of Cr2Se3: 340.8722 g/mol (0.34087 kg/mol)

Calculation of the relative molecular and molar mass of Cr2Se3

• Mr[Cr2Se3] = Ar[Cr] * 2 + Ar[Se] * 3 = 51.9961 * 2 + 78.96 * 3 = 340.8722
• Molar mass (kg/mol) = Mr[Cr2Se3] : 1000 = 340.8722 : 1000 = 0.34087 kg/mol

Cr2Se3: percent composition by element

• Chromium (Cr) = 103.9922 : 340.8722 * 100 = 30.508 %
• Selenium (Se) = 236.88 : 340.8722 * 100 = 69.492 %

Molar mass calculator