What is the mass of aluminium of 306 g of aluminium oxide

Tha nolar mass of aluminium is 26.98 g/mol; the molar mass of (atomic) oxygen is 16.90 g/mol.

Explanation:

1 mol 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 o 108 g.

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.

Explanation:

%aluminium by mass = Molar mass of aluminumMolar mass of alumina×100%.. Approx 27%

Explanation:

So in a molar quantity of aluminum, there is a percentage metal content of,

26.98⋅g⋅mol−1101.96⋅g⋅mol−1×100%=??

And in this mass of alumina there are approx. 6.6⋅g of metal.

%aluminium by mass = Molar mass of aluminumMolar mass of alumina×100%.. Approx 27%

i believe the answer is a.