Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24g mol^–1.

The number of moles =
n =

Here, n = Number of moles

M = Given mass

M = Molar mass

Thus, the number of moles of magnesium (Mg) =

n = 0.5mole