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A storage battery contains a solution of H_(2)SO_(4) 38% by weight. At this concentration, van't Hoff factor is 2.50. At what temperatue will the batter contents freeze? (K_(f) for water =1.86" K kg mol"^(-1)). |
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Answer» Solution :WEIGHT of `H_(2)SO_(4)` (solute), `w_(2)=38g""therefore"Weight of water (solvent), "w_(1)=100-38 = 62g` `therefore " Calculated value of "DeltaT_(f)=(1000K_(f)w_(2))/(w_(1)M_(2))=(1000xx1.86xx38)/(62xx98)=11.633^(@)` `"van't Hoff factor, i "=("Observed "DeltaT_(f))/("Calculated "DeltaT_(f))` `therefore"Freezing POINT "=273-29.08 = 243.92 K.` |
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