BuyFindarrow_forward

Chemistry & Chemical Reactivity

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

Solutions

Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

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

Phenylcarbinol is used in nasal sprays as a preservative. A solution of 0.52 g of the compound in 25.0 g of water has a melting point of −0.36 °C. What is the molar mass of phenylcarbinol?

Interpretation Introduction

Interpretation: The molar mass of phenylcarbinol has to be determined.

Concept introduction:

Colligative properties: Properties of solutions which having influence on the concentration of the solute in it. Colligative properties are,

  • Decrease in the vapor pressure
  • Increase in the boiling point
  • Decline in the freezing point
  • Osmotic pressure

Change in freezing point is calculated by using the equation,

  ΔTfp=Kfpmsolute

  where,

  Kfp is the molal freezing point depression constant.

The number of moles of any substance can be determined using the equation

  Numberofmole=GivenmassofthesubstanceMolarmass

Explanation

The molar mass of phenylcarbinol is calculated.

Given,

  ΔT=0.360C

  Mass of phenylcarbinol is 0.52g

  Mass of water is 25g=0.025kg

  Molal freezing point depression constant of water is 1.860C/m

Change in melting point is calculated by using the equation,

  ΔTfp=Kfpmsolute

Hence,

The concentration is calculated by,

  Concentration,msolute=ΔTfpKfp=(0.360C)(1.860C/m)=0.19355m

Molality (m) =Numberofmolesofsolute1kgofsolvent

The number of moles of phenylcarbinol is,

  (0

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Chapter 13 Solutions

Show all chapter solutions add

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

Which is required as part of hemoglobin? iron calcium vitamin C potassium

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

A cars speedometer reads instantaneous ___. (2.2)

An Introduction to Physical Science

9 Is it possible for an abzyme to affect more than one virus particle?

Introduction to General, Organic and Biochemistry

In what way has biotechnology had an impact on agriculture in the United States?

Human Heredity: Principles and Issues (MindTap Course List)