What are the mole fractions of hydrochloric acid (HCI) and water in a 20% (w/w) aqeous HCl solution?
mass of H2O =100gm-20gm=80gm
Mass of H2O=80gm
Now
20gm×1molhcl36.46gm=0.5485Hcl\frac{20gm\times1mol hcl}{36.46gm}=0.5485Hcl36.46gm20gm×1molhcl=0.5485Hcl
80gm×1molhcl18.015g=4.4407molH2o\frac{80gm\times1mol hcl}{18.015g}=4.4407molH_2o18.015g80gm×1molhcl=4.4407molH2o
χhcl=molhcltotalmol\chi_{hcl}=\frac{mol hcl}{total mol}χhcl=totalmolmolhcl
χhcl=0.55850.548+4.4407=0.1\chi_{hcl}=\frac{0.5585}{0.548+4.4407}=0.1χhcl=0.548+4.44070.5585=0.1
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