Gases are different from solids and liquids. In a sample of gas, the molecules are far apart. The gas molecules also move around and collide with each other as well as with the walls of the container. These collisions generate pressure. The pressure of a gas can be measured in different units. One convenient unit of measure is called the atmosphere (atmatm) because it is based on atmospheric pressure. At sea level, the average pressure is 1 atmatm. As you get higher in altitude, the pressure steadily drops until you leave the atmosphere, where the pressure is very close to 0 atmatm. The table below shows the different commonly used units of measuring gas pressure. Use this table in the pressure unit conversions. Unit Abbreviation 1 atm equivalent atmosphere atmatm 1.00 atmatm (exact) millimeters of mercury mmHgmmHg 760 mmHgmmHg torr torrtorr 760 torrtorr inches of mercury in.Hgin.Hg 29.9 in.Hgin.Hg pounds per square inch (psi) lb/in.2lb/in.2 14.7 lb/in.2lb/in.2 pascal PaPa 101,325 PaPa High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 PaPa) to about 60,000 kPakPa (60,000,000 PaPa). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 3.54×108 PaPa , what is its running pressure in torr? Express the pressure numerically in torr.

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter5: Gases

Section: Chapter Questions

Problem 165MP

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Gases are different from solids and liquids. In a sample of gas, the molecules are far apart. The gas molecules also move around and collide with each other as well as with the walls of the container. These collisions generate pressure. The pressure of a gas can be measured in different units. One convenient unit of measure is called the atmosphere (atmatm) because it is based on atmospheric pressure. At sea level, the average pressure is 1 atmatm. As you get higher in altitude, the pressure steadily drops until you leave the atmosphere, where the pressure is very close to 0 atmatm.

The table below shows the different commonly used units of measuring gas pressure. Use this table in the pressure unit conversions.

Unit	Abbreviation	1 atm equivalent
atmosphere	atmatm	1.00 atmatm (exact)
millimeters of mercury	mmHgmmHg	760 mmHgmmHg
torr	torrtorr	760 torrtorr
inches of mercury	in.Hgin.Hg	29.9 in.Hgin.Hg
pounds per square inch (psi)	lb/in.2lb/in.2	14.7 lb/in.2lb/in.2
pascal	PaPa	101,325 PaPa

High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 PaPa) to about 60,000 kPakPa (60,000,000 PaPa). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 3.54×10⁸ PaPa , what is its running pressure in torr?

Express the pressure numerically in torr.

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