Calculate the molar mass of the following substance and ion.

${\mathrm{Fe}}_2{\left({\mathrm{SO}}_4\right)}_3$

Calculate the molar mass of the following substance and ion.

${\mathrm{S}}_8$

Calculate the molar mass of the following substance and ion.

$\mathrm{Zn}{\left(\mathrm{OH}\right)}_2$

Calculate the molar mass of the following substance and ion.

$\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2$

Calculate the molar mass of the following substance and ion.

${\mathrm{I}}_2$

Calculate the molar mass of the following substance and ion.

${\mathrm{MgSO}}_4.7{\mathrm{H}}_2\mathrm{O}$

Calculate the molar mass of the following ion.

$[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6{]}^{3+}$

Calculate the molar mass of the following substance and ion.

${\mathrm{P}}_2{\mathrm{O}}_5$

Calculate the amount (in mol) in the following mass:

$8.09 \mathrm{g}$ of aluminium