How much aluminum metal is plated?

Question

A current of 15.0 amperes is applied to aqueous solution Al(NO3)3 for 2.00 hours. The grams of Al metal plated are:
A. 0.00 g
B. 8.04 g
C. 10.1 g
D. 30.2 g

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Answer 1 · 2017-12-23T19:27:21

This is an electrolytic cell problem. Electrolysis requires an external current to enable the nonspontaneous reduction-oxidation reaction to occur,

#Al^(3+)(aq) to Al(s)#

Hence,

#2h * (60min)/(h) * (60s)/(min) * (15C)/(s) * ("mol"e^-)/(96485C) * ("mol"Al(s))/(3"mol"e^-) * (27.0g)/("mol"Al(s)) approx 10.1g#

of aluminum metal is plated.