The mass of. Carbon anode consumed in the production of 270kg Al metal from bauxite by hall process giving only carbon dioxide?

Answer 1

We assess the reaction...#Al_2O_3(s) + 3/2 C(s) +Deltastackrel(AlF_3"/"NaF)→ 2 Al(s) + 3/2 CO_2(g)#

The aluminum and fluoride salts are added to the reaction mix to depress the (high) metling point of alumina....even so, this is a very energy intensive reaction. Think about that the next time you throw away that aluminum foil you used to cook your spuds in (and you don't need foil anyway, just cook the scrubbed potatoes in their jackets!).

#"Moles of aluminum"=(270xx10^3*g)/(27.0*g*mol^-1)=10^4*mol#

And given the stoichiometry of the reaction, we produce a #(10^4*mol)/2=5000*mol# quantity of aluminum.

And thus we need an equivalent molar quantity with respect to carbon....

#7500*molxx12.011*g*mol^-1xx10^-3*kg*g^-1=90*kg# with respect to carbon.

Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email

Answer 2

Naomi Aronson

The mass of carbon anode consumed in the production of 270 kg of aluminum metal from bauxite by the Hall process, giving only carbon dioxide, would be approximately 702 kg.

Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.