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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