P22_019.PDF

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Chapter 22 - 22.19
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 . 0kg is
N = M
75 . 0kg
m =
10 31 kg =8 . 23
×
10 31 electrons .
9 . 11
×
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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