Molar and molecular weight of Ca(OH)2

• Molecular formula: Ca(OH)2 or H2CaO2
• Relative molecular weight of Ca(OH)2: 74.09268
• Molar mass of Ca(OH)2: 74.09268 g/mol (0.07409 kg/mol)

Calculation of the relative molecular and molar mass of Ca(OH)2

• Mr[Ca(OH)2] = Ar[H] * 2 + Ar[Ca] + Ar[O] * 2 = 1.00794 * 2 + 40.078 + 15.9994 * 2 = 74.09268
• Molar mass (kg/mol) = Mr[Ca(OH)2] : 1000 = 74.09268 : 1000 = 0.07409 kg/mol

Ca(OH)2: percent composition by element

• Hydrogen (H) = 2.01588 : 74.09268 * 100 = 2.721 %
• Calcium (Ca) = 40.078 : 74.09268 * 100 = 54.092 %
• Oxygen (O) = 31.9988 : 74.09268 * 100 = 43.188 %

Molar mass calculator