P22 019

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19. The mass of an electron is m = 9.11

× 10

31

kg, so the number of electrons in a collection with total

mass M = 75.0 kg is

N =

M

m

=

75.0 kg

9.11

× 10

31

kg

= 8.23

× 10

31

electrons .

The total charge of the collection is

q =

−Ne = (8.23 × 10

31

)(1.60

× 10

19

C)=

1.32 × 10

13

C .


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