Do you mean to two s.f.? or something different?
My text lists the mass of the electron as
How do you figure out how to express the mass of the electron to significant figures?
2 answers
My text lists the mass of the electron as 9.10940 x 10^-31 kg. To two s.f. that is
9.1 x 10^-31 kg.
9.1 x 10^-31 kg.