1 One mole of a substance contains the same number of atoms or molecules as one mole of any other substance.
a Which contains more atoms: 56 g of Fe or 16 g of S? Show your working.

a) Fe contains more atoms.

Explanation:

To find the number of moles we divide by the molar mass:-

56g of iron (Fe) = 56/55.845 = 1.0028 moles

16g of Sulphur (S) = 16/32.06 = 0.6938 moles.

So 56g of Fe contains more atoms.

c (diamond),

sio2 (quartz)