CHEM 1210 Chapter Notes - Chapter 10: Effusion, Root Mean Square, Mean Free Path

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aquamarineguinea-pig798

20 Aug 2016

School

Ohio State University

Department

Chemistry

Course

CHEM 1210

Professor

Kroner Steven

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CHEM 1210 Full Course Notes

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Document Summary

Gasses have very different chemical properties but are similar physically. Gases expand to fill container, have no set volume, and are easily compressible. Two or more gases form homogeneous mixtures regardless of proportions. Pressure: a push that tends to move something in a given direction. Standard atmospheric pressure: the typical pressure at sea level and is the pressure sufficient to support a column of mercury 760 mm high. 1 atm=760 mmhg= 760 torr=1. 01325*105 pa= 101. 325 kpa= 1. 01325 bar. Boyle"s law: the volume of a fixed quantity of gas maintained at constant temperature is inversely proportional to the pressure (v= constant*(1/p)) Charles"s law: the volume of a fixed amount of gas maintained at constant pressure is directly proportional to its absolute temperature (v= constant*t) Avogadro"s hypothesis: equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.

Related Questions

Converting between Units of Pressure 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 (atm) because it is based on atmospheric pressure. At sea level, the average pressure is 1 atm. As you get higher in altitude, the pressure steadily drops until you leave the atmosphere, where the pressure is very close to 0 atm. 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 atm 1.00 atm (exact) millimeters of mercury mmHg 760 mmHg torr torr 760 torr inches of mercury in.Hg 29.9 in.Hg pounds per square inch (psi) lb/in.2 14.7 lb/in.2 pascal Pa 101,325 Pa.

Part C

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 Pa) to about 60,000 kPa (60,000,000 Pa). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 5.81Ã10⁸ Pa , what is its running pressure in torr?

Express the pressure numerically in torr.