What is the relationship between the number of moles $\left(\mathrm{n}\right)$ and molar mass $\left(\mathrm{m}\right)$ of a substance?

Valencies or the charge numbers of some ions are given below: 
Aluminium ion  $3$
Potassium ion  $1$
Sulphate ion  $2$
Magnesium ion $2$
Nitride ion   $3$
Fluoride ion $1$

Using the above information, write down the chemical formulae of Aluminium nitride.

Valencies or the charge numbers of some Ions are given below: 
Aluminium ion  $3$
Potassium ion  $1$
Sulphate ion  $$$2$
Magnesium ion $2$
Nitride ion   $3$
Fluoride ion $1$

Using the above information, write down the chemical formulae of Magnesium nitride.

Valencies or the charge numbers of some Ions are given below: 
Aluminium ion  $3$
Potassium ion  $1$
Sulphate ion  $2$
Magnesium ion $2$
Nitride ion   $3$
Fluoride ion $1$

Using the above information, write down the chemical formulae of Aluminium sulphate.

Valencies or the charge numbers of some Ions are given below: 
Aluminium ion  $3$
Potassium ion  $1$
Sulphate ion  $2$
Magnesium ion $2$
Nitride ion   $3$
Fluoride ion $1$

Using the above information, write down the chemical formulae of Potassium fluoride.