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? (1 point)
You would use the following expression:
(7.5 * 10^-10 kg) / (9.1 * 10^-31 kg)