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750 mm Hg दाप पर जल का क्वथनांक `99.63^(@)C` है 500g जल में कितना सुक्रोज मिलाया जाए कि इसका `100^(@)C` पर क्वथनांक हो.

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क्वथनांक उन्नयन `DeltaT_(b)=(K_(b)xx1000xxw_(B))/(M_(B)xxw_(A))`
`DeltaT_(b)=100-99.63=0.37`
`K_(b)` क्वथनांक उन्नयन स्थिरांक (मलाल उन्नयन स्थिरांक )
`=052Kg mol ^(-1)`
`M_(B)=` विलेय का मोलर द्रव्यमान
`=342` (सुक्रोज) `C_(12)H_(22) O_(11)`
`W_(B)` = विलेय का भार= ?
`W_(A)` विलायक का भार
`DeltaT_(b)=0.37=(0.52xx100xxw_(2))/(342xx500)`
`w_(B)=(0.37xx342xx500)/(0.52xx1000)`
`w_(B)=12.167`
अतः `121.67g` सुक्रोज मिलाना पड़ेगा.

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