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Byju's Answer
Standard XII
Chemistry
Percentage Composition
Determine the...
Question
Determine the percentage of water of crystallization in a sample of green vitriol.
A
45.32
%
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B
31.26
%
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C
22.59
%
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D
75.45
%
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Solution
The correct option is
A
45.32
%
Molecular formula of green vitriol is
F
e
S
O
4
.7
H
2
O
.
Formula mass =
56
+
32
+
(
4
×
16
)
+
(
7
×
(
2
+
16
)
)
=
278
amu
Mass of water of crystallization
=
7
×
18
=
126
amu
% of water of crystallization
=
(
126
/
278
)
×
100
=
45.32
%
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