Question

What is the molar mass of Sodium hydroxide?

Answer 1

Step1. Molar mass

The mass of $1$ mole of a substance is called its molar mass.

Step2. Formula for molar mass

Molar mass =$\text{The atomic mass of element × number of atoms given in subscript}$

Step3. Molar mass of Sodium hydroxide$\left(\mathrm{NaOH}\right)$

Molar mass of $\mathrm{NaOH}$=$\mathrm{The}\mathrm{atomic}\mathrm{mass}\mathrm{of}\text{Na+}\mathrm{The}\mathrm{atomic}\mathrm{mass}\mathrm{of}\text{O+}\mathrm{The}\mathrm{atomic}\mathrm{mass}\mathrm{of}\text{H}$

=$\left(22.99{\text{g mol}}^{-1}{\text{+16.00 g mol}}^{-1}{\text{+1.0079 g mol}}^{-1}\right)$

=$39.99{\text{g mol}}^{-1}\hspace{0.17em}$

Hence, the molar mass of $\mathrm{NaOH}$ is .$39.99{\text{g mol}}^{-1}\hspace{0.17em}$.