Answer to Question #308884 in Electricity and Magnetism for Junard

Question #308884

What are the mole fractions of hydrochloric acid (HCI) and water in a 20% (w/w) aqeous HCl solution?

1
Expert's answer
2022-03-10T18:01:58-0500

mass of H2O =100gm-20gm=80gm

Mass of H2O=80gm

Now

20gm×1molhcl36.46gm=0.5485Hcl\frac{20gm\times1mol hcl}{36.46gm}=0.5485Hcl

Now

80gm×1molhcl18.015g=4.4407molH2o\frac{80gm\times1mol hcl}{18.015g}=4.4407molH_2o

χhcl=molhcltotalmol\chi_{hcl}=\frac{mol hcl}{total mol}

χhcl=0.55850.548+4.4407=0.1\chi_{hcl}=\frac{0.5585}{0.548+4.4407}=0.1


χH2o=(1χHcl)=(10.1)=0.9\chi_{H_2o}=(1-\chi_{Hcl})=(1-0.1)=0.9


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