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A single Hall-Heroult cell produces about 1 ton of aluminum in 24 hours What current must be used to accomplish this?
1 ton = 1000000g
26.98g Al = 1 mol Al
so find moles of Al. you'll get 37065.4922 mol Al
taking the mol Al, convert it to mol of electrons using the half reaction
Al3+ + 3e- --> Al
then use faraday's constant (96500 C/mol, where mol is mol of electrons). by now, you have the units coulombs. you know that A = C/sec.
24 hrs = 86400 sec
now you'll get 124191.7882.
if you need the answer in sig figs, it is 1E5 A.
ton --> grams --> mol Al --> mol e- --> coulombs (charge) --> amps (current)
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