Question

A 100W,200V incandescent lamp is connected in series with an electrolytic cell containing copper sulphate solution.What weight of copper will be deposited by a current flowing for 5 hours?(at. Wt. of Cu=63.54)

Answer 1

Answer:

ANSWER

Current,I=

Volt

Watt

=

110 V

200 W

=1.818 A

The quantity of electricity passed =Q(C)=1.818 A×30×60 s=3272.72 C

Atomic weight of zinc = 65.4 gm/mol

Moles of electrons passed =

96500

mol e

−

C

Q(C)

=

96500

mol e

−

C

3272.72 C

=0.0339 mol e

−

The weight of zinc deposited =molar mass of Zn×moleratio ×moles of electrons passed

=65.4

mol

g

×

2 mol e

−

1 mol Zn

× 0.0339 mol e

−

=1.1 gm