Molar and molecular weight of WSe2

• Relative molecular weight of WSe2: 341.76
• Molar mass of WSe2: 341.76 g/mol (0.34176 kg/mol)

Calculation of the relative molecular and molar mass of WSe2

• Mr[WSe2] = Ar[W] + Ar[Se] * 2 = 183.84 + 78.96 * 2 = 341.76
• Molar mass (kg/mol) = Mr[WSe2] : 1000 = 341.76 : 1000 = 0.34176 kg/mol

WSe2: percent composition by element

• Tungsten (W) = 183.84 : 341.76 * 100 = 53.792 %
• Selenium (Se) = 157.92 : 341.76 * 100 = 46.208 %

Molar mass calculator