Question

Calculate the relative molecular mass of ${\mathrm{H}}_2{\mathrm{SO}}_4$.

Answer 1

Step 1: Calculate the mass of hydrogen, sulfur, and oxygen atoms:

Mass of 2 atoms of hydrogen $\left(\mathrm{H}\right)$ is $2\mathrm{x}1=2\mathrm{u}$

Mass of 1 atom of sulfur $\left(\mathrm{S}\right)$ is $1\mathrm{x}32=32\mathrm{u}$

Mass of 4 atoms of oxygen $\left(\mathrm{O}\right)$ is $4\mathrm{x}16=64\mathrm{u}$

Step 2: Calculate the relative molecular mass of Sulphuric acid ${\mathrm{H}}_2{\mathrm{SO}}_4$:

The relative molecular mass of ${\mathrm{H}}_2{\mathrm{SO}}_4$ = Mass of 2 hydrogen atoms + Mass of 1 sulfur atom + Mass of 4 oxygen atoms

$=2+32+64=98\mathrm{u}$

Hence, the relative molecular mass of ${\mathrm{H}}_2{\mathrm{SO}}_4$ is $98\mathrm{u}$.