Chlorine gas (Cl2) can be produced from a solution containingCl ions; e.g., from

Question

Chlorine gas (Cl2) can be produced from a solution containingCl ions; e.g., from Na+Cl, by electrolysis. Whatmust be the current through an electrolytic cell to produce 1.0 kgof Cl2 gas in 18 hours?

Use a charge of 1.6 × 1019 C, Avogadro’s number6.02 × 1023, and an atomic mass of 35.5 g for Chlorine.Answer in units of A.

Explanation / Answer

2Cl- =>   Cl2 + 2e- 1.0 kg Cl2 *(1000 g /1 kg) *(1 mol Cl2/ 2*35.5 g Cl2) *(2 mol e- /1mol Cl2) *(6.02 e23 e- / mol e-) *(1.6e-19 C/ e-) = 2713239.44 Coulombs Current = Charge/Time = (2713239.44 C/ 18 hrs)*(1 hr / 60 min)*(1min/ 60 s) Current = 41.870979 Amps ~ 42 A

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