Question

Calculate the molar mass of Calcium Hydroxide.

• A. 65 g/mol
• B. 84 g/mol
• C. 74 g/mol
• D. 100 g/mol

Answer 1

The correct option is C 74 g/mol

The Molar Mass of Ca= 40 g/mol.
The Molar Masses of O and H are 16 g/mol and g/mol respectively.

Thus, the Molar Mass of $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$ is
40 + 2(16+1)= 74 g/mol.