Question

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

Answer 1

Mass of one electron = 9.10939 × 10^-31 kg

∴ Number of electrons that weigh 9.10939 × 10^-31 kg = 1

Number of electrons that will weigh 1 g = (1 × 10^-3 kg)

`= 1/(9.10939 xx 10^(-31)) xx (1xx10^(-3) " kg")`

`= 0.1098 × 10^(-3 + 31)`

= 0.1098 × 10²⁸

= 1.098 × 10²⁷