Question

An electron has a mass of 9.109×10-31 grams.what will be the mass of 5 million electrons?

Answer 1

since 1 million has 6zeroes i.e. 1000000
and
1 e's mass =9.109*10-31grams
therefore..
5000000 e's mass will be=9.109*10-31*5000000
=4.5545*10-24

Answer 2

Answer:

Mass of an electron=9.109*10^-31

Mass of 5 millions electrons=9.109*10^-31*5000000

=9.109*10^ -31*5*10^6

9.109*5*10^-25

=45.545*10^-25

4.5545*10^-24