S C Kheterpal, S N Dhawan and, P N Kapil Solutions for Chapter: Some Basic Concepts of Chemistry, Exercise 12: PROBLEMS FOR PRACTICE

Find the percentage composition of potassium chlorate (${\mathrm{KClO}}_3$).

Calculate the percentage of ${{\mathrm{SO}}_4}^{2-}$ in pure crystals of Mohr's salt, viz.,${\mathrm{FeSO}}_4.({\mathrm{NH}}_4{)}_2{\mathrm{SO}}_4.6{\mathrm{H}}_2\mathrm{O}.$

Calculate the percentage of ${\mathrm{H}}_2\mathrm{O}$ in pure crystals of Mohr's salt, viz.,${\mathrm{FeSO}}_4.({\mathrm{NH}}_4{)}_2{\mathrm{SO}}_4.6{\mathrm{H}}_2\mathrm{O}.$

Calculate the percentage of water of crystallization in the sample of washing soda,${\mathrm{Na}}_2{\mathrm{CO}}_3.10 {\mathrm{H}}_2\mathrm{O}.$

A sample of clay is found to have the formula ${\mathrm{Al}}_2{\mathrm{O}}_3.{\mathrm{K}}_2\mathrm{O}.6{\mathrm{SiO}}_2.$ Calculate the percentage of alumina (${\mathrm{Al}}_2{\mathrm{O}}_3$), potassium oxide (${\mathrm{K}}_2\mathrm{O}$) and silica (${\mathrm{SiO}}_2$) in the sample.

${\mathrm{Fe}}_2({\mathrm{SO}}_4{)}_3$ is used in water and sewage treatment to aid the removal of suspended impurities. Calculate the mass percentage of iron, sulphur and oxygen in this compound.

Calculate the percentage of carbon, hydrogen and oxygen in ethanol (${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$).