Question

1. Calculate the number of electrons which will together weigh one gram.

 2. Calculate the mass and charge of one mole of electrons.

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Answer 1

1. Mass of one electron = 9.11 × 10^-31 kg 

∴ Number of electrons in one gram = \(\frac{10^{-3} kg}{9.11\times 10^{-31}kg}\) = 1.098 x 10²⁷

2. Mass of one electron = 9.11 × 10^-31 kg 

∴ Mass of 1 mole of electrons = 9.11 × 10^-31kg × 6.022 × 10²³  

= 5.486 x 10^-7 kg

Charge on one electron = 1.602 × 10^-19 C 

∴ Charge on one mole of electrons = (1.602 × 10^-19 C) × (6.022 × 10²³) 

= 9.65 × 10⁴ C.