Question #161263

The vapor pressure of water above a solution of water and a nonvolatile solute at 68 °F is 2.3 cm Hg. What is the mole fraction of the solute? (The vapor pressure of pure water is 23.8 torr at 25°C).


1
Expert's answer
2021-02-09T03:36:32-0500

We know that 1cmHg= 10torr

2.3cm Hg= 23torr

P=Ppure×molefraction23=23.8×molefractionmolefraction=0.96P=P_{pure}×mole fraction\\ 23=23.8×mole fraction\\ mole fraction= 0.96



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