SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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3
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2
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5
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None of the above
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Detailed explanation-1: -2 o 3 now find the number of moles of aluminium of aluminium that will be equal to in 1 mole. We have 2 moles of aluminium, or we can say that 1 molecule of a l, 2 o 3 contains 2 atoms of aluminium.
Detailed explanation-2: -Finally we have a balanced equation: 4Al + 3O2–> 2Al2O3 . There 4 aluminums on each side and 6 oxygens on each side!
Detailed explanation-3: -The mole ratio of Al to Al2O3 is 4:2. Use this mole ratio for the stoichiometry conversion.
Detailed explanation-4: -The percent aluminum in Al2O3 is 100% * 2(26.982 g/mol) / 101.961 g/mol = 52.926%.
Detailed explanation-5: -Aluminium ore is called bauxite (Al 2O 3). The bauxite is purified to yield a white powder – aluminium oxide (also known as alumina) – from which aluminium can be extracted. The extraction is done by electrolysis, but first the aluminium oxide must be melted so that electricity can pass through it.