Question

Calculate the number of electron which will together weigh one gram..

Answer 1

Explanation:

Mass of an electron = 9.1 x 10-28 g

Or

9.1 x 10-28 g contains = 1 electron

Therefore 1g contains = 1/9.1 x 10-28 *1 = 1.098 x 1027 electrons

(ii) We know, one mole of electron = 6.022 x 1023 electron

Mass of one electron = 9.1 × 10–28 g

Or

mass of 6.022 x 1023 electron = 9.1 x 10-28 x 6.022 x 1023 = 5.48 x 10-4 g

Charge on one electron = 1.6× 10–19 coulomb

Charge on one mole of electron = (1.6× 10–19 C x 6.022 × 1023)

= 9.63 × 104 C