The mass of a dust particle is approximately 7.5x10^-10 kilograms and the mass of an electron is 9.1x10^-31 kilograms. Which expression would you use to find out how many electrons you need to equal the mass of one dust particle?
To find out how many electrons are needed to equal the mass of one dust particle, you would use the expression:
(7.5x10^-10 kg) / (9.1x10^-31 kg per electron) = x electrons
This expression calculates the number of electrons needed to equal the mass of one dust particle by dividing the mass of the dust particle by the mass of one electron.