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Byju's Answer
Standard XII
Chemistry
Mole Concept
Calculate the...
Question
Calculate the mass of a formula unit of the complex
F
e
S
O
4
.
7
H
2
O
in unified atomic mass unit.
A
230 u
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B
250 u
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C
278 u
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D
270 u
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Solution
The correct option is
C
278 u
The atomic mass of iron (
F
e
) = 56 u, sulphur (
S
) = 32 u,
Oxygen (
O
) = 16 u, hydrogen (
H
) = 1 u
So, the molecular mass of the complex
F
e
S
O
4
.
7
H
2
O
=
(
56
+
32
+
11
×
16
+
14
×
1
)
= 278 u
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