Q. 14.1( 250 Votes )

(i) Calculate the

Answer :

(i) As we know that

Mass of one electron = 9.1× 10-28 g


1 electron weighs 9.1× 10-28 g


So, X electrons will weigh 1 g


X = [1] / [9.1× 10-28]


= 1.098×1027 electrons


Therefore 1.098×1027 electrons together weigh 1g.


(ii) By Avogadro’s Law we know that


1 mole of electron = 6.023×1023 electrons


Mass of one electron = 9.1× 10-28g


Therefore, Mass of 1 mole of electrons = [6.023×1023] × [9.1× 10-28]


= 5.4809× 10-4g


We also know that charge of one electron = 1.6× 10-19 C


Therefore, Charge of 1 mole of electron is = [6.023×1023] × [1.6× 10-19]


= 96.368×103 C


Therefore, mass of one mole of electron is 5.481× 10-4 g and the charge is 96.37×103 C.

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