To find out how many electrons you need to equal the mass of one dust particle, you would use the expression:
(7.5 x 10^-10 kg)/(9.1 x 10^-31 kg)
The mass of a dust particle is approximately 7.5 x 10^-10 kilograms and the mass of an electron is 9.1 x 10^-31 kilograms. which expression would you use to find out how many electrons you need to equal the mass of one dust particle
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