What is the mass of aluminium thatbwould be obtained from 9 tonnes of aluminiun oxide?

1 Answer
anor277
Mar 26, 2018

From #"9 tonies"#?

Explanation:

We first write a stoichiometric equation....

#Al_2O_3(s) rarr 2Al(s) + 3/2O_2(g)#

Aluminum refining is HIGHLY energy intensive...the aluminum smelters no doubt have to pay a big electricity bill to pay for the electrons they need for reduction. I have seen some aluminum refiners site their foundry next to a hydroelectric dam.

#"Moles of aluminum oxide"=(9*"tonne"xx10^3*kg*"tonne"^-1xx10^3*g*kg^-1)/(101.96*g*mol^-1)=88269.6*mol#.

And by stoichiometry we should get TWICE this molar quantity with respect to aluminum metal....agreed?

#2xx88269.9*molxx26.98*g*mol^-1=2381552.2*g#

#~=2.4*"tonne aluminum metal"#

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