Question

At $27^{\circ} \mathrm{C}$, the vapor pressure of pure water is 23.76 mmHg and that of an urea solution is 22.98 mmHg . Calculate the molality of solution. 

   At $27^{\circ} \mathrm{C}$, the vapor pressure of pure water is 23.76 mmHg and that of an urea solution is 22.98 mmHg . Calculate the molality of solution.
Chemistry
Chemistry
Raymond Chang, Jason… 14th Edition
Chapter 12, Problem 128 ↓
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At $27^{\circ} \mathrm{C}$, the vapor pressure of pure water is 23.76 mmHg and that of an urea solution is 22.98 mmHg . Calculate the molality of solution.
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At $27^{\circ} \mathrm{C},$ the vapor pressure of pure water is $23.76 \mathrm{mmHg}$ and that of an aqueous solution of urea is $22.98 \mathrm{mmHg}$. Calculate the molality of urea in the solution.

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At $27^{\circ} \mathrm{C}$, the vapor pressure of pure water is $23.76$ $\mathrm{mmHg}$ and that of an urea solution is $22.98 \mathrm{mmHg}$. Calculate the molality of solution.

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At 23°C, the vapor pressure of pure water is 23.70 mmHg and that of an aqueous dilute solution of urea is 22.98 mmHg. Calculate the molality of the solution.
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00:01 The solution to solve for the molality of the solution we need the moles of solute that is urea and the kilograms of solvent that is water if we assume that we have one mole of water we know the mass of water using the change in vapor pressure we can solve for the mole fraction of urea and then the moles of urea now solve for the mole fraction of urea now solve for the mole fraction of urea we have the equation of delta p equal to p10 minus p1 is equal to x2 p10 here p1 not is the partial pressure of a solvent over a solution p1 is given by the vapor pressure of the pure solvent that is delta p equal to 23 .76 m mhm hg minus 22 .98 m mhg which is equal to 0 .78 mhm hg now we have the equation that delta p equal to x urea multiply by p water.
01:08 So x urea equal to delta p by p water.
01:12 Here substituting the values and solving we get the value 0 .033.
01:18 Now assume we have one mole of water now solve for moles of urea.
01:23 So x urea equal to moles of urea divided by moles of urea plus moles of water...
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