Answer:
63.6%
Step-by-step explanation:
The given compound is: 
 N₂O; 
The problem here is to find the percent composition of nitrogen in the compound. 
First find the molar mass of the compound: 
 Molar mass of N₂O = 2(14) + 16 = 44g/mol 
So; 
 Percentage composition of Nitrogen = 
 x 100 = 63.6%
 x 100 = 63.6%