Question

The mass of an electron is 9.11*10^-28g. The number of electrons in 1 kg would be

Answer 1

mass = 9.11×10^(-28)g

given quantity = 1kg = 1000g

number of electrons = 1000÷9.11×10^(-28) = 1.08 ×10^30

Answer 2

Given,

Mass of an electron = 9.11 × 10⁻²⁸ g

We know,

1000g = 1kg

Or 10³ × 9.11 × 10⁻²⁸ = 9.11 × 10⁻²⁵ kg