The mass of a dust particle is approximately 7.5×10

Question

−10
kilograms and the mass of an electron is 9.1×10
−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)

(7.5×10
−10
)÷(9.1×10
−31
)

(9.1×10
−31
)÷(7.5×10
−10
)

(9.1×10
−31
)(7.5×10
−10
)

(9.1×10
−31
)−(7.5×10
−10
)

(7.5×10
−10
)(9.1×10
−31
)

Answer 1

To find out how many electrons are needed to equal the mass of one dust particle, you would divide the mass of the dust particle by the mass of one electron.

The correct expression to use is:

\[ (7.5 \times 10^{-10}) \div (9.1 \times 10^{-31}) \]

So the correct answer is:

\[ (7.5 \times 10^{-10}) \div (9.1 \times 10^{-31}) \]