Question

The mass of a dust particle is approximately 7.5×10−107.5×10−10 kilograms and the mass of an electron is 9.1×10−319.1×10−31 kilograms. Which expression would you use to find out how many electrons you need to equal the mass of one dust particle?(1 point)

Answer 1

You would use the expression:

\( \dfrac{\text{mass of dust particle}}{\text{mass of electron}} \)

This can be written as:

\( \dfrac{7.5 \times 10^{-10}}{9.1 \times 10^{-31}} \)