Question

Find the number of Cations in 51g of Aluminium Oxide. (Aℓ = 27, O = 16)

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Answer 1

Answer:

Aluminium Oxide formula is Al2O3

molar mass of Al2O3 = 102g/mol

given, 51 g

therefore no of moles = 51/102 = 0.5 mol

no of Al2O3 molecules in 0.5 mol = 0.5 Na

now one Al2O3 molecule contains 2 Al3+ cations

no of cations in 0.5 Na molecules = 0.5Na * 2 = Na = 6.022*10^23 cations

Explanation:

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