Final answer:
The mole coefficient for N2 in the balanced equation N2(g) + O2(g) --> N2O(g) is 1.
Step-by-step explanation:
The balanced chemical equation is:
N2(g) + O2(g) --> N2O(g)
The mole coefficient for N2 in the balanced equation is 1. This means that 1 mole of N2 is required for the reaction to occur and produce 1 mole of N2O.