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)
Responses
(9.1×10−31)(7.5×10−10)
open paren 9 point 1 times 10 to the negative 31 power close paren times open paren 7 point 5 times 10 to the negative 10 power close paren
(7.5×10−10)(9.1×10−31)
open paren 7 point 5 times 10 to the negative 10 power close paren times open paren 9 point 1 times 10 to the negative 31 power close paren
(7.5×10−10)÷(9.1×10−31)
open paren 7 point 5 times 10 to the negative 10 power close paren divided by open paren 9 point 1 times 10 to the negative 31 power close paren
(9.1×10−31)÷(7.5×10−10)
open paren 9 point 1 times 10 to the negative 31 power close paren divided by open paren 7 point 5 times 10 to the negative 10 power close paren
(9.1×10−31)−(7.5×10−10)
1 answer
To find out how many electrons you need to equal the mass of one dust particle, you should divide the mass of the dust particle by the mass of one electron.
The correct expression to use is:
\[ (7.5×10^{-10}) \div (9.1×10^{-31}) \]
So the answer is:
(7.5×10−10)÷(9.1×10−31)
