If 15 g of aluminum from an empty soda can could be used as an anode of a battery, how long could it supply a current of 10 amps?

Question

Quizplus · Accepted Answer

The reaction at the anode is Al → Al³⁺ + 3e⁻. The molar mass of Al is 27 g/mol, so 15 g of Al is 15/27 mol. Each mole of Al provides 3 moles of electrons, so 15/27 mol of Al provides (15/27)*3 mol of electrons. The charge provided by these electrons is (15/27)*3*96485 C. The time to supply 10 A (10 C/s) is [(15/27)*3*96485]/10 s, which is approximately 4.5 hours.

If 15 G of Aluminum from an Empty Soda Can