Pure aluminium is obtained by electrolysis from an ore called bauxite. Bauxite d

Question

Pure aluminium is obtained by electrolysis from an ore called bauxite. Bauxite does not have a specific composition. It is a mixture of aluminum oxides, aluminum clay minerals, materials such as quartz, hematite, magnetite, siderite, and goethite. The aluminum minerals in bauxite can include: gibbsite Al(OH)_3, boehmite AlO(OH), and, diaspore, AlO(OH). The exact composition is depending on the origin of the ore. Your ore is composed by 85% of aluminum hydroxide which is converted into alumina (aluminium oxide) Al_2O_3 by heating. What is the molecular mass of alumina? M_Al = 26.98g/mol and M_o = 16.00g/mol What is the mass of alumina necessary to obtain 1 ton of pure aluminium? In your company, a production unit can process 1.45 t/day of bauxite. What is the daily production of pure aluminium? Explain in few words what is the absolute zero. What is the value of absolute zero in kelvin and in celsius degrees

Explanation / Answer

a)

Molecular Mass:

Aluminia --> Al2O3 = 2*MW of Al + 3*MW of O = 2*26.98 + 3*16 = 101.96 g/mol of Al2O3

b)

Mass of alumina required fr 1 tn of pure alumina

for pure aluminium

% of Al = 2*26.98 / 101.96 *100 = 52.9227 %

now

fr 1ton = 1000 kg = 10^6 g of al --> find mass

(10^6)/(52.9227/100) = 1889548.341 g of Al2O3 required = 1.889 ton of Al2O3 required

c)

1.45 ton of bauxit a day

find pures production..

1.45 ton of bauxit

--> 0.85 aluminum

so

bauxit --> 0.85 aluminium hydrxide

of which

fraciton of aluminium --> 26.98 / (26.98 + 3*17) = 0.34598

0.34598*(0.85 *1.45) = 0.4264203 ton of aluminium will be produced per day

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