1.

A solutioncontaining 30 g of non-volatile solute exactly in 90 g of water has avapourpressure of 2.8 kPa at 298 K.Further, 18 g of water is then added tothesolution and the new vapour pressure becomes 2.9 kPa at 298 K.Calculate: molar mass of the solute vapour pressure of water at 298 K.

Answer»

A solution
containing 30 g of non-volatile solute exactly in 90 g of water has a


vapour
pressure of 2.8 kPa at 298
K.
Further, 18 g of water is then added to


the
solution and the new vapour pressure becomes 2.9 kPa at 298
K.
Calculate:



  1. molar
    mass of the solute


  2. vapour
    pressure of water at 298
    K.




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