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Byju's Answer
Standard XII
Chemistry
Stoichiometric Calculations
How many gram...
Question
How many grams of
K
2
C
r
2
O
7
is required to oxidise
12.41
g of
F
e
S
O
4
to
F
e
2
(
S
O
4
)
3
in an acidic medium?
(
K
2
C
r
2
O
7
=
294
;
F
e
S
O
4
=
152
)
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Solution
The reaction is:
6
F
e
S
O
4
+
K
2
C
r
2
O
7
+
7
H
2
S
O
4
→
3
F
e
2
(
S
O
4
)
3
+
K
2
S
O
4
+
C
r
2
(
S
O
4
)
3
+
7
H
2
O
12.41 g of
F
e
S
O
4
corresponds to 0.082 mole of
F
e
S
O
4
.
Mole of
K
2
C
r
2
O
7
required is
0.082
6
.
Hence, grams of potassium dichromate =
0.082
6
×
294
=
4.018
gms
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0
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