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Chemistry
Chemistry
Problem
In acidic solution the half-reaction below is partially written.
Cr
2
O
7
2
−
+
14
H
+
+
_
_
_
e
−
→
2
Cr
3
+
+
7
H
2
O
\text{Cr}_2\text{O}_7^{2-} + 14\,\text{H}^+ + \_\_\_\,e^- \rightarrow 2\,\text{Cr}^{3+} + 7\,\text{H}_2\text{O}
Cr
2
O
7
2
−
+
14
H
+
+
___
e
−
→
2
Cr
3
+
+
7
H
2
O
What integer coefficient of electrons balances the charge in this half-reaction? a) 7 b) 3 c) 6 d) 8
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