Question

No. of e in 50 gram of Co, :
(N. - Avogadro No.)
(1) 25 (2) 50 N. (3) 25 N. (4) 50
​

Answer 1

atomic no of Cobalt is 27

atomic weight of Cobalt is 58.9 g

I mole of Co is 58.8 g

x moles of Co is 50g

x=50/58.8

=0.85moles

no of electrons in 50g of Co is

1mole has 58.8*avagdro number of electrons

then

0.85 moles has 50*avagdro no of electrons

ANSWER is 2)50N