Work out the ${\mathrm{M}}_{\mathrm{r}}$ for the following, and say whether it is the relative molecular mass or the relative formula mass:

Methane, ${\mathrm{CH}}_4$

Work out the ${\mathrm{M}}_{\mathrm{r}}$ for the following, and say whether it is the relative molecular mass or the relative formula mass:

Chlorine, ${\mathrm{Cl}}_2$

Work out the ${\mathrm{M}}_{\mathrm{r}}$ for the following, and say whether it is the relative molecular mass or the relative formula mass:

Butane, ${\mathrm{C}}_4{\mathrm{H}}_{10}$

Work out the ${\mathrm{M}}_{\mathrm{r}}$ for the following, and say whether it is the relative molecular mass or the relative formula mass:

Ethanol, ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$

Work out the ${\mathrm{M}}_{\mathrm{r}}$, for the following, and say whether it is the relative molecular mass or the relative formula mass:

Ammonium sulphate, ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4$