Chapter 15.6, Problem 2.3ACP

### 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

# A 0.64 g sample of the white crystalline dimer (4) is dissolved in 25.0 mL of benzene at 20 °C. Use the equilibrium constant to calculate the concentrations of monomer (2) and dimer (4) in this solution.

Interpretation Introduction

Interpretation: Concentration of monomer and dimer at equilibrium has to be identified.

Concept Introduction: At equilibrium the concentration of the reaction and the product is equated to a constant K, where K is known as the equilibrium

If a reaction is as aA+bBcC+dD ,

The equilibrium constant K=[C]c[D]d[A]a[B]b

Molarity: The concentration for solutions is expressed in terms of molarity as follows,

Molarity = No. of moles of soluteVolume of solution in L

Explanation

Using the equation given below,

MolarityÂ =Â No.Â ofÂ molesÂ ofÂ soluteVolumeÂ ofÂ solutionÂ inÂ L

No:â€‰ofâ€‰molesâ€‰=â€‰MassÃ—1molâ€‰Molarâ€‰â€‰mass

On calculating the concentration,

[dimer]0â€‰=((0.64)(1mol/486

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