Question

If the density of copper is 8.94g/cm3 the number

Answer 1

the density of Cu is 8.94 g/cm3. The quantity of electricity needed to plate an area 100cm2 to a thikness of 1/102 cm using  CuSo4 solution is ?





vol. of Cu to be plated =100*1/10=10cc

wt. of cu reqd.= 8.94*10=89.4

moles of cu = 89.4/63.5

Cu2++2e-----------.> Cu

Moles of electron = 89.4*10*2

amt. of electricity= 89.4*10*2/96500 Farads


or





Volume (V) of Cu = Area x thickness = 10x10 x 1/102 = 1.

d = m/V

m = d x V= 8.94 x 1 = 8.94.

Hence, Actual mass of Cu to be plated is 8.94 g.

Now, Cu2+ + 2e- -------> Cu

So, 2F --------> 63.5 g Cu

       2 x 96500 C -------> 63.5g Cu

                   P  C -------> 8.94 g Cu

                   P = 2 x 96500 x 8.94/96500 = 27172.

Hence, the answer is 27172




ok say me that which one is correct?

Answer 2

Answer:

0.28F

This is the easiest method