Molar and molecular weight of H3As

• Molecular formula: H3As or AsH3
• Relative molecular weight of H3As: 77.94542
• Molar mass of H3As: 77.94542 g/mol (0.07795 kg/mol)

Calculation of the relative molecular and molar mass of H3As

• Mr[H3As] = Ar[H] * 3 + Ar[As] = 1.00794 * 3 + 74.9216 = 77.94542
• Molar mass (kg/mol) = Mr[H3As] : 1000 = 77.94542 : 1000 = 0.07795 kg/mol

H3As: percent composition by element

• Hydrogen (H) = 3.02382 : 77.94542 * 100 = 3.879 %
• Arsenic (As) = 74.9216 : 77.94542 * 100 = 96.121 %

Molar mass calculator