Question

can weight deposited by equivalent weight give us no. of moles? (question from faraday's law) as there is a question which says: How many atoms of calcium will be deposited from a solution of CaCl2 by a current of 25 milliamperes flowing for 60 seconds

Answer 1

Dear Student
It can give us number of moles but you must take care to do the calculations carefully and remember the n-factor for the atoms.

$Reactionis:C{a}^{2+}+2e^{-}\to Ca$
Now charge flown=$25x{10}^{-3}x60=1500x{10}^{-3}=1.5C$

96500 x 2 C charge is required to deposit 40 g Calcium.
so Calcium deposited by (40/(96500 x2)) x 1.5=0.000310 g Ca

Regards