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?
Cu
Fe
S
2
+
?
Fe
2
(
S
O
4
)
3
+
?
O
2
→
?
Cu
S
O
4
+
?
Fe
S
O
4
+
?
H
2
S
O
4
+
?
H
2
O
Error: Error in balancing the equation: There is an infinite amount of solutions.