The molecular mass of sugar [${\mathrm{C}}_{12} {\mathrm{H}}_{22}{\mathrm{O}}_{11}$ ] is:

$[\mathrm{C}=12, \mathrm{H}=1, \mathrm{O}=16]$

Unit formula mass of ammonium phosphate [$({\mathrm{NH}}_4{)}_3{\mathrm{PO}}_4$] is

$[\mathrm{N}=14, \mathrm{H}=1, \mathrm{P}=31, \mathrm{O}=16]$

The mass percentage composition of sulphur in calcium sulphate is:

$\left[\mathrm{Ca}=40, \mathrm{S}=32, \mathrm{O}=16\right]$

The mass percentage composition of oxygen in $\mathrm{Pb}({\mathrm{NO}}_3{)}_2$ is: 

$\left[\mathrm{Pb}=207, \mathrm{N}=14, \mathrm{O}=16\right]$