Calculate the number of electrons which will together weigh one gram. Calculate the mass and charge of one mole of electrons.



Q.1:- (i)Calculate the number of electrons which will together weigh one gram.
(ii) Calculate the mass and charge of one mole of electrons.

 

 

Answer:-

(i) Mass of one electron = 9.11×10-31kg
∴ 1g = 10-3 kg =  (1/9.11×10-31)×10-3 electrons = 1.098×1027

(ii) Mass of one electron = 9.11×10-31kg



∴ Mass of 1 mole of electrons = (9.11×10-31)×(6.022×1023) = 5.48×10-7 kg
Charge on one electron = 1.602×10-19 coulomb
∴ Charge on 1 mole of electrons = (1.602×10-19)×(6.022×1023) = 9.65×10coulombs.