Question

What mass (in g) of lithium metal can be produced by the electrolysis of molten LiCl for 23.93 hr with an electrical current of 17.7?

Answer 1

Answer:

1.828 g

Explanation:

The half-reaction is:

• Li⁺ + 1e⁻ → Li(s)

First we calculate the coulombs:

• Coulombs = Amperes * seconds

• 23.93 hr * 60 = 1435.8 s

• Coulombs = 17.7 A * 1435.8 s = 25413.66 C

Then we calculate the number of lithium moles, using Faraday's constant:

• 25413.66 C * $\frac{1mol(e^-)}{96485C} *\frac{1molLi}{1mol(e^-)}$ = 0.2634 mol Li

Finally we convert moles to grams:

• 0.2634 mol Li * 6.941 g/mol = 1.828 g