标准状况下,1L水中溶解700L NH3,所得溶液密度为0.9g/cm3,则氨水密度为 A18.4mol/L B 20.4Mmol/L C37.7% 标准状况下,1L水中溶解700L NH3,所得溶液密度为0.9g/cm3,则氨水密度为A18.4mol/L B 20.4Mmol/L C37.7% D 38.5% (讲

Question

标准状况下,1L水中溶解700L NH3,所得溶液密度为0.9g/cm3,则氨水密度为 A18.4mol/L B 20.4Mmol/L C37.7%
标准状况下,1L水中溶解700L NH3,所得溶液密度为0.9g/cm3,则氨水密度为
A18.4mol/L B 20.4Mmol/L C37.7% D 38.5% (讲解）

Answer 1

700升NH3物质的量=700/22.4=31.25mol,质量=31.25*17=531.25克.
溶液体积=（1000+531.25）/0.9=1701立方厘米=1.7升.
物质的量浓度=31.25/1.7=18.4摩尔/升.
溶质质量分数=531.25/(1000+531.25)=34.7%.
选A.