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. How many electrons does it take to equal the mass of a dust particle? (1 point)
6.8 * 10 ^ - 41
1.2 * 10 ^ - 21
8.2 * 10 ^ - 20
O 1.2 * 10 ^ 21
6.8 * 10 ^ - 40
8.2 * 10 ^ 20
To find out how many electrons would equal the mass of a dust particle, you need to divide the mass of the dust particle by the mass of one electron:
(7.5 * 10^-10 kg) / (9.1 * 10^-31 kg/electron)
= (7.5 / 9.1) * 10^(-10 - (-31))
=0.824175824 * 10 ^ (21)
= 8.2 * 10 ^ 20
Therefore, it would take approximately 8.2 * 10 ^ 20 electrons to equal the mass of a dust particle. The answer is: 8.2 * 10 ^ 20.