Giancoli's Physics: Principles with Applications, 7th Edition

13

Temperature and Kinetic Theory

Change chapter13-1: Atomic Theory

13-2: Temperature and Thermometers

13-4: Thermal Expansion

13-5: Gas Laws; Absolute Temperature

13-6 and 13-7: Ideal Gas Law

13-8: Ideal Gas Law in Terms of Molecules; Avogadro's Number

13-9: Molecular Interpretation of Temperature

13-11: Real Gases; Phase Changes

13-12: Vapor Pressure and Humidity

13-13: Diffusion

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.

Problem 32

Q

A

$4.39 \textrm{ atm}$

In order to watch this solution you need to have a subscription.

VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. When we write the ideal gas law, we have to look at what's constant and what's changing between the two scenarios before and after the temperature is raised and the compression happens and so on. So, initially we have a pressure of 2.45 atmospheres. And then there's gonna be a new pressure after the compression. So, that means the pressure is gonna change. And so in the first scenario we'll give it a subscript 1 and in the second scenario we'll give it a subscript 2. And the volume also is gonna change. So, it needs a subscript *V1* here and *V2* down here. The number of moles of oxygen is not going to change because the container is sealed. So, *n* does not need a subscript and *R* is just the universal gas constant. And the temperature does change so, it means at *T1* here. So, we have *P V* over *T1* by dividing both sides by *T1* equals *n R*. And in the second scenario after the compression, we'll have a new pressure and a new volume and a new temperature and *P2 V2* over *T2* is also also going to equal the same *n R*. So, since they both equal *n R*, they are equal to each other. And then we can solve for *P2*. Multiplying both sides here by *T2* over *V2* and we get pressure 2 is temperature 2 times pressure 1 volume 1 divided by volume 2 times temperature 1. So, temperatures are in absolute, temperature is kelvin. The pressures, we can leave as atmospheres because, well, if we put our pressure in atmospheres here, that means our answer will also be in atmospheres. The volume, we can leave as liters because the liters are just going to cancel. And you could convert them into cubic meters if you like but it doesn't make any difference because the conversion factor will cancel anyway. The temperature you always have to convert it into kelvin because the conversion is not created by multiplying by a conversion factor that it's going to cancel, instead the conversion involves adding a number and so this does not cancel, the 273.15 does not cancel on the top and bottom because it's not a factor, it's a number that's added, it's a term. So, you have to do that conversion. Well, add 56 degrees Celsius as the final temperature plus 273.15 times 2.45 atmospheres times 61.5 liters to begin with divided by the final volume of 38.8 liters after it's compressed times by the initial temperature of 18 degrees Celsius plus 273.15. And you get 4.39 atmospheres will be the pressure after it's been compressed.

Giancoli Answers, including solutions and videos, is copyright © 2009-2024 Shaun Dychko, Vancouver, BC, Canada. Giancoli Answers is not affiliated with the textbook publisher. Book covers, titles, and author names appear for reference purposes only and are the property of their respective owners. Giancoli Answers is your best source for the 7th and 6th edition Giancoli physics solutions.