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The boiling point of water at `750mm Hg` is `99.63^(@)C`. How muCHM sucrose is to be added to `500 g` of water suCHM that it boils at `100^(@)C`. |
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Answer» Correct Answer - `1108.2g` `T_(b)(H_(2)O` at `750mm ` of pressure `=99.63^(@)C`, `T_(b)(` solution `)=100^(@)C` `DeltaT_(b)=100-96.63^(@)=3.37^(@)` `(` Note the difference in Kelvin and degree centrigrade is same `)` `W_(1)=500g,Mw_(1)(H_(2)O)=18gmol^(-1)` `Mw_(2)(`Sucrose`)=342 g mol^(-1), W_(2)=?` Applying the formula, `DeltaT_(b)=K_(b)xxm=K_(b)xx(W_(2)xx1000)/(Mw_(2)xxW_(1))(K_(b)=0.52K kgmol^(-1))` `3.37k=0.52xx(W_(2)xx1000)/(342xx500)` `:. W_(2)=(3.37Kxx342g mol^(-1)xx500g)/(0.52K kg mol^(-1)xx1000)` `=1108.2g` |
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