Molar and molecular weight of (CH3)2As(O)OH

• Molecular formula: (CH3)2As(O)OH or C2H7AsO2
• Relative molecular weight of (CH3)2As(O)OH: 137.99738
• Molar mass of (CH3)2As(O)OH: 137.99738 g/mol (0.138 kg/mol)

Calculation of the relative molecular and molar mass of (CH3)2As(O)OH

• Mr[(CH3)2As(O)OH] = Ar[C] * 2 + Ar[H] * 7 + Ar[As] + Ar[O] * 2 = 12.0107 * 2 + 1.00794 * 7 + 74.9216 + 15.9994 * 2 = 137.99738
• Molar mass (kg/mol) = Mr[(CH3)2As(O)OH] : 1000 = 137.99738 : 1000 = 0.138 kg/mol

(CH3)2As(O)OH: percent composition by element

• Carbon (C) = 24.0214 : 137.99738 * 100 = 17.407 %
• Hydrogen (H) = 7.05558 : 137.99738 * 100 = 5.113 %
• Arsenic (As) = 74.9216 : 137.99738 * 100 = 54.292 %
• Oxygen (O) = 31.9988 : 137.99738 * 100 = 23.188 %

Molar mass calculator