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Standard X
Chemistry
Conservation of Mass
Calculate the...
Question
Calculate the number of oxygen atoms in 10 millimoles of
[
F
e
(
H
2
O
)
5
N
O
]
S
O
4
:
A
0.01
N
A
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B
0.1
N
A
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C
N
A
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D
10
N
A
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Solution
The correct option is
B
0.1
N
A
Number of O-atoms in one formula unit of
[
F
e
(
H
2
O
)
5
N
O
]
S
O
4
=
10
Therefore, number of O-atoms in one mole of
[
F
e
(
H
2
O
)
5
N
O
]
S
O
4
=
10
N
A
So, number of O-atoms in 10 millimoles of
[
F
e
(
H
2
O
)
5
N
O
]
S
O
4
=
10
×
10
−
3
×
10
N
A
=
0.1
N
A
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0
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