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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.