How many electrons must be added in the following reaction? MnO4- -----------> MnO2 a. 3 electrons...
How many electrons must be added in the following reaction?
MnO4- -----------> MnO2
a. 3 electrons to the right side
b. 6 electrons to the left side
c. 2 electrons to the left side
d. 3 electrons to the left side
Homework Answers
Let find the oxidation state of Mn in MnO4-
O has -2 oxidation state
use:
oxidation state of Mn + 4*oxidation state of O = net charge
oxidation state of Mn + 4*(-2) = -1
oxidation state of Mn - 8 = -1
oxidation state of Mn = +7
Similarly,
oxidation state of Mn in MnO2 is +4
So,
oxidation state of Mn changes from +7 to +4
Hence 3 e- must be added to reactant
Answer: d
Let find the oxidation state of Mn in MnO4-
O has -2 oxidation state
use:
oxidation state of Mn + 4*oxidation state of O = net charge
oxidation state of Mn + 4*(-2) = -1
oxidation state of Mn - 8 = -1
oxidation state of Mn = +7
Similarly,
oxidation state of Mn in MnO2 is +4
So,
oxidation state of Mn changes from +7 to +4
Hence 3 e- must be added to reactant
Answer: d
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