Chapter 2: Q13-107P (page 40)

In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.053 g of poly (vinyl alcohol) in enough water to make 100.0mL of solution. At, $25^{\circ} C$ the osmotic pressure of this solution is 0.272 atm. What is the molar mass of polymer sample?

Short Answer

Expert verified

The molar mass of polymer is $5345.785 g / m o l$ .

Step by step solution

Osmotic pressure

Osmotic pressure is defined as the pressure that must be applied to the solution side to stop fluid movement when a semi-permeable membrane separates a solution from pure water.

Calculation of molar mass

In the question it is given that volume of solution is 100L, osmotic pressure 0.272atm, temperature 2 $25^{\circ} C$ and mass of poly (vinyl alcohol) is 6.053g.

So, we can calculate the molar mass from the equation n=MRT.

Where M is the molarity of solution, R gas constant $(0.082 L . a t m / m o l K . K)$ and T temperature.

$n = \frac{(\frac{m a s s o f p o l y (v i n y l a l c o h o l)}{m o l a r m a s s})}{v o l u m w o f s o l u t i o n (L)} R T m o l a r m a s s = \frac{(\frac{m a s s o f p o l y (v i n y l a l c o h o l)}{n})}{v o l u m w o f s o l u t i o n (L)} R T = \frac{(\frac{6.053 g}{0.272 a t m})}{0.1 L} \times 0.082 L . a t m / m o l . K \times 298 K = 5345.785 g / m o l$

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In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.053 g of poly (vinyl alcohol) in enough water to make 100.0mL of solution. At, $25^{\circ} C$ the osmotic pressure of this solution is 0.272 atm. What is the molar mass of polymer sample?

Short Answer

Step by step solution

Osmotic pressure

Calculation of molar mass

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In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.053 g of poly (vinyl alcohol) in enough water to make 100.0mL of solution. At,25∘Cthe osmotic pressure of this solution is 0.272 atm. What is the molar mass of polymer sample?

Short Answer

Step by step solution

Osmotic pressure

Calculation of molar mass

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Ionic and Molecular Compounds

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Study anywhere. Anytime. Across all devices.

In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.053 g of poly (vinyl alcohol) in enough water to make 100.0mL of solution. At, $25^{\circ} C$ the osmotic pressure of this solution is 0.272 atm. What is the molar mass of polymer sample?