   # Ethanol, CH 3 CH 2 OH, has a vapor pressure of 59 mm Hg at 25 °C. What quantity of energy as heat is required to evaporate 125 mL of the alcohol at 25 °C? The enthalpy of vaporization of the alcohol at 25 °C is 42.32 kJ/mol. The density of the liquid is 0.7849 g/mL. ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 11, Problem 11PS
Textbook Problem
40 views

## Ethanol, CH3CH2OH, has a vapor pressure of 59 mm Hg at 25 °C. What quantity of energy as heat is required to evaporate 125 mL of the alcohol at 25 °C? The enthalpy of vaporization of the alcohol at 25 °C is 42.32 kJ/mol. The density of the liquid is 0.7849 g/mL.

Interpretation Introduction

Interpretation: The energy required to evaporate 125mLof alcohol has to be determined.

Concept Introduction:

The energy required to overcome the intermolecular forces of attraction for 1mol of a substance is called standard enthalpy of vaporization,ΔvapH0

Equation for density is,

Density=MassVolume

From given mass is the number of moles are calculated as follows,

Number of moles=GivenmassMolecularmass

### Explanation of Solution

Given,

Density=0.7849g/mLVolume=125mLMolarmass=46.07g/molEnthaplyofvaporization,ΔvapH0=42.32kJ/mol

Equation for density is,

Density=MassVolume

Hence the mass of ethanol is shown as follows,

Mass=Density×Volume=0.7849g1mL×125mL=98.11g =2

### 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

Find more solutions based on key concepts
The roles of protein in the body include all but a. blood clot formation. b. tissue repair. c. gas exchange. d....

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

_______ is/are removed from a new mRNA a. Introns b. Exons c. A poly-A tail d. Amino acids

Biology: The Unity and Diversity of Life (MindTap Course List)

What are the moral implications of using ergogenic aids?

Understanding Nutrition (MindTap Course List)

A diode is a device that allows current to be carried in only one direction (the direction indicated by the arr...

Physics for Scientists and Engineers, Technology Update (No access codes included)

Can marine sediments tell us about the history of the ocean from the time of its origin?

Oceanography: An Invitation To Marine Science, Loose-leaf Versin 