Question

What is the molar mass of sulfuric acid ${\mathrm{H}}_2{\mathrm{SO}}_4$?

Answer 1

Step 1: Molar mass:

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

Step 2: Formula for molar mass

• $\mathrm{Molar}\mathrm{mass}=\mathrm{The}\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{element}\times \mathrm{number}\mathrm{of}\mathrm{atoms}\mathrm{given}\mathrm{in}\mathrm{subscript}$

Step 3: Calculation of Molar mass of sulfuric acid $\left({\mathrm{H}}_2{\mathrm{SO}}_4\right)$:

$$\begin{gathered} \mathrm{Molar}\mathrm{mass}\mathrm{of}{\mathrm{H}}_2{\mathrm{SO}}_4=\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{H}+\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{S}+\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{O} \\ \mathrm{Molar}\mathrm{mass}\mathrm{of}{\mathrm{H}}_2{\mathrm{SO}}_4=\left(2\times 1.0079\mathrm{g}{\mathrm{mol}}^{-1}\right)+\left(32.06\mathrm{g}{\mathrm{mol}}^{-1}\right)+\left(4\times 16.00\mathrm{g}{\mathrm{mol}}^{-1}\right) \\ \mathrm{Molar}\mathrm{mass}\mathrm{of}{\mathrm{H}}_2{\mathrm{SO}}_4=2.0158\mathrm{g}{\mathrm{mol}}^{-1}+32.06\mathrm{g}{\mathrm{mol}}^{-1}+64\mathrm{g}{\mathrm{mol}}^{-1}=98.0758\mathrm{g}{\mathrm{mol}}^{-1} \end{gathered}$$

Thus, the molar mass of sulfuric acid $\left({\mathrm{H}}_2{\mathrm{SO}}_4\right)$is $98.0758\mathrm{g}{\mathrm{mol}}^{-1}$.