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At 25°C the vapor pressure of pure water is 23.76 mmHg and

Chapter 12, Problem 74P

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QUESTION:

At 25°C the vapor pressure of pure water is 23.76 mmHg and that of seawater is 22.98 mmHg. Assuming that seawater contains only NaCl, estimate its molal concentration.

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QUESTION:

At 25°C the vapor pressure of pure water is 23.76 mmHg and that of seawater is 22.98 mmHg. Assuming that seawater contains only NaCl, estimate its molal concentration.

ANSWER:

Step 1 of 2

The vapor pressure of the solvent over a solution is given by the product of the vapor pressure of the pure solvent and the mole fraction of the solvent in the solution is stated by Raoult's law.

where  and  are the partial pressures over the solution for components  and  and  are the vapor pressures of the pure substances; and  and  are their mole fractions.

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