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1516 Lecture Notes - Lecture 19: Mole Fraction, Intermolecular Force, Ideal Gas

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School
University of Canberra
Department
University of Canberra
Course
1516
Professor
Karen Altamore

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Document Summary

All of these are composed of atoms, ions or molecules. > we can do this by varying the temperature and/or pressure. It is the attractive forces between the atoms, ions or molecules that in uence the state. Gases expand to occupy all the space in their container therefore the volume of a gas is equal to the volume of the container in which it is held. One de ning characteristic of a gas is its exerted pressure : > pressure : as force exerted by gas on a given area (symbol p, si unit pascal (pa), Pa = n. m-2, i. e. force per unit area) Other pressure units may include bar (bar), atmospheres (atm) or mm of hg (mmhg). This law states that at constant temperature the volume of a given mass of a dry gas is inversely proportional to its pressure.

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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 5.81×108 Pa , what is its running pressure in torr?

Express the pressure numerically in torr.

Answer all

question 1) Propane for home heating is sometimes purchased by the pound, where the tank is weighed before delivery and again after the customer has finished using it. Which quantity or quantities are constant in this situation?

a.) n

b.) V

c.) T

d.) P

e.) none of these

QUESTION 2) Pressure is defined as force per unit area, and it is affected by
I. the number of collisions between molecules and the walls of the container.
II. the force of the collisions between molecules and the walls of the container.
III. the strength of the attractions between the molecules of the gas.
IV. the strength of the attractions between the molecules of the gas and the walls of the container.

a.) I and II only

b.) III and IV only

c.) I and III only

d.) none of these

e.) all of these

QUESTION THREE) On a warm spring afternoon, you enter the lab, put on your safety glasses, and open a bottle labeled “pure acetic acid.” In addition to the liquid you observe a strong odor of vinegar. Which phases of matter are present in the container?

a.) gas only

b.) solid, liquid and gas

c.) liquid and gas

d.) gas and solid

e.) solid and liquid