This equation shows how relative formula mass, number of moles, and mass are related.

n = m/M_r

where

• n = amount (mol)
• m = mass (g)
• M_r = relative formula mass

This equation shows how volume, number of moles, and concentration are related.

n = c x V

where

• n = number of moles (mol)
• c = concentration (mol/L)
• V = volume (L)