在标况下① 6.72 L CH4 ② 3.01×1023 HCl分子 ③ 13.6 g H2S ④ 0.2 mol NH3（大小排序)
问题描述：
在标况下① 6.72 L CH4 ② 3.01×1023 HCl分子 ③ 13.6 g H2S ④ 0.2 mol NH3（大小排序)
1.标况下气体体积
2.四种气体的质量
3.四种气体所含原子个数
答
CH4:6.72 L,6.72/22.4 = 0.300 mol,0.300*16 = 4.80g,原子个数:5*0.300 = 1.50NA
HCl 0.500 mol,11.2 L,0.500*36.5 = 18.25 g,原子个数,0.500*2 = 1.00NA
H2S:13.6/34 = 0.400 mol,22.4*0.400 = 8.96 L,13.6 g,原子个数:0.400*3 = 1.2NA
NH3:0.2*22.4 = 4.48L,0.2*17 = 3.4 g,原子个数:0.200*4 = 0.800NA
1.HCl > H2S > CH4 > NH3
2.HCl > H2S > CH4 > NH3
3.CH4 > H2S > HCl > NH3