CALCULATE MOLARITY OF AN aq. SOLUTION OF UREA WHOSE VAPOUR PRESSURE IS REDUCED BY 25%.
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Raoult's equation shows how to calculate the change in the vapor pressure of a solution from the vapor pressure of the pure solvent: Psolution = xsolventPsolvent, where Psolution is the resulting vapor pressure of the solution, xsolvent is the mole fraction of the solvent and Psolvent is the vapor pressure of the pure ...
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Given
Ps=(98100)P0
We know that
P0−PsPs=w×Mm×W
⇒wm×W×1000×M1000
Molality =w×1000m×W
∴P0−PsPs=molality ×M1000
∴P0−(98/100)P0(98/100)P0=molality ×100018
∴ Molality =2P0/10098100P0×100018
=1.133
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