1.分子所含有的原子数目依次增加.
N2 N2O NH3 HNO3 N2O4
2 3 4 5 6
2.N元素的质量分数由小到大排列.
HNO3 N2O4 N2O NH3 N2
22% 30.4% 63.6% 82.4% 100%