Please help! I will give brainilist........
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Start by writing the atoms balance:
Now, determine the change of oxidation states:
has oxidation state 0, so each N has to gain 3 electrons to become 
.
That, means that you need 6 electrons to balance the charges, resulting in:
And the answer is 6 mole of electrons.
Now, determine the change of oxidation states:
That, means that you need 6 electrons to balance the charges, resulting in:
And the answer is 6 mole of electrons.