1.
氨水的物质的量浓度
=(700/22.4)÷[(17×700/22.4+1×1000)÷(0.9×1000)]
=18.4mol/L
质量分数
=(17×700/22.4)÷(17×700/22.4+1×1000)×100%
=34.7%
2.
(10×1.84×98%/98)÷1=0.184mol/L
3.
1molMgCl2含镁离子1mol,clˉ2mol
300mL该溶液中镁离子的物质的量
=1.18×300×5.1%/24
=0.75225mol
300mL该溶液中clˉ的物质的量
=0.75225×2=1.5045mol