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Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: A solution of a nonvolatile solute in water has a boiling point of 380.4 K .Calculate the vapor pressure of water above this solution at 338 K. The vapor pressure of pure water at this temperature is

Solution: A solution of a nonvolatile solute in water has a boiling point of 380.4 K .Calculate the vapor pressure of water above this solution at 338 K. The vapor pressure of pure water at this temperature is

Problem

A solution of a nonvolatile solute in water has a boiling point of 380.4 K .

Calculate the vapor pressure of water above this solution at 338 K. The vapor pressure of pure water at this temperature is 0.2467 atm.

Solution

We’re being asked to calculate the vapor pressure of water at 338K (64.85oC) above a solution of a nonvolatile solute in water having a boiling point of 380.4K. (107.25oC). 

The vapor pressure of pure water at this temperature is 0.2467 atm.


Recall that the boiling point of a solution is higher than that of the pure solvent and the change in boiling point (ΔT­b) is given by:     

Tb = Tb, solution - Tb, pure solventTb= 107.25 Co -100.0 CoTb= 7.25 Co

   

The change in boiling point is also related to the molality of the solution:


Tb = Kbm


where: 

m = molality of the solution (in m or mol/kg)

Kb = boiling point elevation constant (0.512 ˚C/m)


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