A solution contains 21.1 grams of NaCl in 0.721 kg water at 25 °C. What is...

A solution contains 21.1 grams of NaCl in 0.721 kg water at 25 °C. What is the vapor pressure of the solution?

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Expert Solution

vapor pressure of solution = vapor pressure of solvent * mole fraction of solvent

Psolution = P⁰ * X solvent

no of moles of water ( n water) = 721/18 = 40.05moles

no of moles of NaCl ( n NaCl) = 21.1/58.5 = 0.36 moles

mole fraction of water (Xwater) = n water/n water + n NaCl

= 40.05/40.05 + 0.36

= 40.05/40.41 = 0.991

The vapor pressure of water at 25⁰C = 23.8 torr

Ps = P⁰* Xsolvent

= 23.8*0.991 = 23.586 torr >>>answer

queen_honey_blossom answered 1 year ago

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