设1体积水吸收V体积的氨气可制得浓度为12mol/l,密度为0.915g/cm^3的氨水,设水电体积为1L,则NH3的体积为VL.
已知:
M(NH3)=17g/mol
ρ(H2O)=1g/cm^3
Vm=22.4L/mol
ρ(溶液)=0.915g/cm^3
c(NH3)=12mol/L
n(NH3)=V/22.4(mol),
m(NH3)=17g/mol*V/22.4mol=17V/22.4(g)
m(H2O)=1000ml*1g/cm^3=1000g
m(溶液)=(1000+17V/22.4)g
v(溶液)=(1000+17V/22.4)g/0.915g/cm^3
c(NH3)=(V/22.4)/[(1000+17V/22.4)g/0.915g/cm^3]=12mol/l
得v=378.05L