Question

calculate the number of aluminium ions present in 5.1g of aluminium oxide (atomic mass of al=27u o=16u)

Answer 1

Hello! Let me try to answer this :)

NB:
Ar: Atomic mass
Mr: Molecular mass of Al2O3
= 27 x 2 + 16 x 3 = 102

Thanks and please correct if there are any mistakes ^ ^