The mass of a dust particle is approximately 7.5×10^−10 kilograms and the mass of an electron is 9.1×10^−31 kilograms. Which expression would you use to find out how many electrons you need to equal the mass of one dust particle?

Answer 1

To find out how many electrons are needed to equal the mass of one dust particle, you can use the following expression:

(number of electrons) = (mass of dust particle) / (mass of one electron)

(number of electrons) = 7.5×10^−10 kg / 9.1×10^−31 kg

(number of electrons) = (7.5×10^−10 kg) / (9.1×10^−31 kg)

(number of electrons) = (7.5 / 9.1) × 10^(−10-(-31))

(number of electrons) = 0.825 × 10^21

Therefore, you would need approximately 8.25×10^20 electrons to equal the mass of one dust particle.