Chapter 10, Problem 10PS

### 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

# You have a sample of CO2 in flask A with a volume of 25.0 mL. At 20.5 °C, the pressure of the gas is 436.5 mm Hg. To find the volume of another flask, B, you move the CO2 to that flask and find that its pressure is now 94.3 mm Hg at 24.5 °C. What is the volume of flask B?

Interpretation Introduction

Interpretation:

Given the initial volume, temperature and pressure of a gas and the volume of the gas at new pressure and temperature has to be given.

Concept Introduction:

Different laws have been put forward to introduce properties of gases:

Boyle’s law:

At fixed temperature, the volume of a fixed amount of gas is inversely proportional to the pressure exerted by the gas.

P1V(n,Twillbeconstant)

Charles’s law:

States that volume is directly proportional to temperature when the gas is held

at constant pressure and number of molecules.

VT

General Gas Law: Combining Charles’s law and Boyle’s law we get the General gas law or combined gas law.

P1V1T1=P2V2T2

Explanation

From Combined Gas law,

â€‚Â P1V1T1â€‰â€‰=â€‰â€‰P2V2T2

Given data:

P1â€‰â€‰=â€‰436.5â€‰mmâ€‰HgP2â€‰â€‰=â€‰94.3â€‰mmâ€‰HgT1â€‰â€‰â€‰=â€‰â€‰20.5Â°Câ€‰=â€‰293.5â€‰KT2â€‰â€‰â€‰=â€‰â€‰24.5Â°Câ€‰â€‰=â€‰297

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