The mass of a dust particle is approximately 7.5 × 10 ^-10 and the mass of an electron is which expression would you use to find out how many electron is 9.1 × 10^-31 kilograms. Which equation would you used to find out how many electrons you need to equal the mass of one dust particle.

Answer 1

To find out how many electrons are equivalent to the mass of one dust particle (7.5 × 10 ^-10 kg), you would use the following equation:

Number of electrons = Mass of dust particle / Mass of one electron
Number of electrons = 7.5 × 10 ^-10 kg / 9.1 x 10 ^-31 kg

Number of electrons ≈ 8.24 x 10 ^20 electrons

Therefore, you would need approximately 8.24 x 10 ^20 electrons to equal the mass of one dust particle.