(i) Calculate the number of aluminium ions present in 5.1g of Al2O3.
(ii) How many atoms are there in 12g of C-12 atoms?
(iii) Calculate the number of moles in 16g of oxygen gas.
(Atomic mass of Ca=40u, S=32u, O=16u, C=12u, H= 1u, Al=27u)
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