(i) Calculate the number of electrons which will together weigh one gram.
(ii) Calculate the mass and charge of one mole of electrons.
(ii) Calculate the mass and charge of one mole of electrons.
Solution and Explanation
(i) Mass of one electron = 9.10939 × 1031 kg
∴ Number of electrons that weigh 9.10939 × 1031 kg = 1
Number of electrons that will weigh 1 g = (1 × 103 kg)
= \(\frac{1}{9.10039}\) × 10-31 kg × (1 × 10-3 kg)
= 0.1098 × 103 + 31
= 0.1098 × 1028
= 1.098 × 1027
(ii) Mass of one electron = 9.10939 × 1031 kg Mass of one mole of electron
= (6.022 × 1023) × (9.10939 ×1031 kg)
= 5.48 × 107kg
Charge on one electron = 1.6022 × 1019 coulomb
Charge on one mole of electron = (1.6022 × 1019 C) (6.022 × 1023)
= 9.65×10 4C
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