electrolysis of a molten metal chloride MCl3 using a current of 6.50 A for 1397 seconds deposits 1.41 g of the metal at the cathode. What is the metal?
One Faraday of charge will move one mole of electrons.
One Faraday is 96500 coulombs.
One coulomb is one amp per second. So in this case we are using 6.5 x 1397
coulombs = 9080.5 C. That is equivalent to 0.094 mol. of electrons.
In MCl3 the metal must be M3+, so it needs 3 moles of electrons to fully
discharge a mole of it. Or 1/3 mol from one mol of electrons.
0.094 mol electrons produces 1.41 g
so 1 mol electrons produces 15 g
15 g is 1/3 moles. One mol is 45 g.
The metal is scandium.