First you have to divide it by seven and then with the numbers do you have to put in the first quiz and then you have to add it on
Answer:

Explanation:
The given reaction is an example of oxidation reaction. The step-by-step balancing procedure has been shown below:
Chemical equation: 
Balance H and O in basic medium: 
Balance charge: 
Balanced chemical equation:

A.3 moles H2
1 mole N2
I think it is correct