1,冰醋酸含ch3cooh的质量分数为0.995,d(密度）=1.05kg/l,求ch3cooh的摩尔浓度c和质量摩尔浓度b2,浓氨水含nh3的质量分数28％,求nh3的质量摩尔浓度b和摩尔分数x

Question

1,冰醋酸含ch3cooh的质量分数为0.995,d(密度）=1.05kg/l,求ch3cooh的摩尔浓度c和质量摩尔浓度b
2,浓氨水含nh3的质量分数28％,求nh3的质量摩尔浓度b和摩尔分数x

Answer 1

1、
c=n/V,b=n/m
M(HAc)=60g/mol
n(HAc)=m*0.995/60
则b=m*0.995/60/m=0.995/60=0.0166mol/g
V=m/d
则c=m*0.995/60/(m/1050)=17.4mol/L
2、
含NH3质量分数 28% 则含水质量分数 72%
设总质量为m
n(NH3)=m*28%/17
n(H2O)=m*72%/18
b(NH3)=m*28%/17/m=0.016
x(NH3)=m*28%/17/(m*28%/17+m*72%/18)=0.29