Chapter 13.4, Problem 13.7CYU

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# Bradykinin is a small peptide (9 amino acids; 1060 g/mol) that lowers blood pressure by causing blood vessels to dilate. What is the osmotic pressure of a solution of this protein at 20 °C if 0.033 g of the peptide is dissolved in water to give 50.0 mL of solution?

Interpretation Introduction

Interpretation: The osmotic pressure of the Bradykinin solution measured at 20oC, to be identified.

Concept introduction:

Osmotic pressure: The pressure created by the column of solution for the system at equilibrium is a measure of the osmotic pressure.

Osmotic pressure, Π = cRT,where,cismolar concentration,Ris Gas constant,Tisaabsolute temperature.

Explanation

Given data:

MolarÂ MassÂ ofÂ BradykininÂ (solute)Â =Â 1060Â g/mol.MassÂ ofÂ BradykininÂ Â =â€‰Â 0.033Â gVolumeÂ ofÂ WaterÂ =Â 50Â mlTÂ =Â 20âˆ˜CÂ =Â 20âˆ˜C+273=293KÎ =?

Osmotic pressure can be calculated using the equation:

OsmoticÂ pressure,Â Î Â =Â cRT,where,â€‰câ€‰isâ€‰molarÂ concentration,â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰Râ€‰isÂ GasÂ constant,â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰Tâ€‰isâ€‰aâ€‰absoluteÂ temperature.

Thus the concentration should be calculated.

no.ofÂ molesâ€‰â€‰=Â MassMolarÂ massÂ =Â â€‰0

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