Question

Calculate the molar mass of Sulphuric acid ${\mathrm{H}}_2{\mathrm{SO}}_4$.

Answer 1

• The molar mass of a substance can be calculated by adding the atomic masses of all the atoms present in the atom.

1. ($\mathrm{H}$) atomic mass =$1$
2. ($\mathrm{S}$) atomic mass =$32$
3. ($\mathrm{O}$) atomic mass =$16$

• ${\mathrm{H}}_2{\mathrm{SO}}_4$ molar mass can be calculated by adding atomic masses of Hydrogen, Sulfur, and Oxygen = $2\mathrm{x}\mathrm{mass}\mathrm{of}\mathrm{H}\mathrm{atom}+\mathrm{mass}\mathrm{of}\mathrm{S}\mathrm{atom}+4\mathrm{x}\mathrm{mass}\mathrm{of}\mathrm{O}\mathrm{atom}$

=$2\times 1+32+4\times 16=98$

• Hence, the molar mass of ${\mathrm{H}}_2{\mathrm{SO}}_4$ is $98\mathrm{g}$.