Q.

How many number of aluminium ions are present in 0.051 g of aluminium oxide?

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a

6.023×1023 ions

b

3 ions

c

6.023×1020 ions

d

9 ions

answer is C.

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Detailed Solution

Mass of Al2O3=2×27+3×16=1020.051 g of Al2O3=0.051102=0.0005 mol mole of Al2O3 contains 2×6.023×1023Al3+ ions 0.0005 mole of Al2O3 contains 2×0.0005×6.023×1023Al3+ ions =6.023×1020Al3+ ions.
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How many number of aluminium ions are present in 0.051 g of aluminium oxide?