Answer to Question #121403 in Physical Chemistry for moreen

Question

Aluminium metal can be made from aluminium ions by electrolysis. What mass of aluminium metal would be recovered if a current of 2.50 × 103 A passed through the solution for 15.0 minutes? Assume the yield is 100%.
A. 210 g
B. 105 g
C. 70 g
D. 240 g

Answer 1

We know that

$$w = \frac{MIt}{nF}$$

Where

M= Molar mass

I = current

t= time

n= charge on ion

F = Faraday's constant = 96500

So

$$w=\frac{27\times2.5\times 10^3\times15\times 60}{3\times96500}\\=70gm$$

Hence option (c)