Question

10. If mass of one electron is 9.11 x 10
g then how many electon in 1g
(a) 1.10 x 1025
(c) 110 x 10-27
(b) 1.093 x 1023
(d) 0.1093 x 1028​

Answer 1

Answer:

Given : mass of an electron=9.11 x 10⁻³¹kg

=9.11 x 10⁻²⁸g 1kg

=1000g

Number of electrons present in 1kg will be :

=1000/9.11 x 10⁻²⁸

=109.76 x 10 ²⁸

∴ Number of electrons present in 1kg would be 109.