Question

what mass of aluminium is produced from 100g of aluminium oxide?

Answer 1

Answer:

The molar mass of aluminium is 26.98 g/mol; the molar mass of (atomic) oxygen is 16.00 g/mol.

1 mole of Al₂O₃ therefore has a mass of 2(26.98) + 3(16.00) = 101.96 g.

Divide this into the given mass, to find the number of moles here:

(204 g)/(101.96 g/mol) = 2.001 mol.

There are 2 moles of aluminium per mole of aluminium oxide, so there are

2(2.001) = 4.002 moles of aluminium in the sample.

Then there are (4.002 mol)(26.98 g/mol) = 107.97 g of Al. Since the given mass has only 3 significant figures, round this answer to 108 g.

Explanation:

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Answer 2

Answer:

108 g

Explanation:

Molar mass of aluminium = 26.98 g/mol

Molar mass of oxygen = 16 g/mol

Mass of 1 mole of Al2O3 = 2(26.98) + 3(16)

= 101.96g

No. of moles = (204g) / (101.96g/mol) = 2.001 mol

There are two moles of aluminium per mole of aluminium oxide , so there are = 2(2.001) = 4.002

Then there are (4.002mol) (26.98g/mol) = 107.97 g of Al = 108 g