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# Topic: Gas constant

 Gas Laws: Ideal Gas Law and the Gas Constant   (Site not responding. Last check: 2007-11-02) For a constant amount of gas at a constant pressure, the volume of the gas is directly proportional to the absolute temperature. In effect, the pressure of the gas should be directly proportional to both the molar concentration and the temperature. Use the slope of the plot to determine the gas constant in units of L atm mole www.chm.davidson.edu /ChemistryApplets/GasLaws/GasConstant.html   (306 words)

 The Ideal Gas Equation   (Site not responding. Last check: 2007-11-02) An "ideal gas" is one whose physical behavior is accurately described by the ideal-gas equation gas produced is collected in a 750 ml flask. A 1 liter sample of air at room temperature (25 °C) and pressure (1 atm) is compressed to a volume of 3.3 mls at a pressure of 1000 atm. wine1.sb.fsu.edu /chm1045/notes/Gases/IdealGas/Gases04.htm   (440 words)

 Gas Laws: Avogadro's Law   (Site not responding. Last check: 2007-11-02) Charles's Law (sometimes called the Gay-Lussac Law) states that the volume of a gas is directly proportional to the temperature of the gas, provided the amount of gas and pressure are held constant. If gas were being added, the valve to the vacuum pump would be closed and the valve to the gas tank would be gently opened to vent gas into the system. Gas could be removed from the bulb by closing the valve to the gas tank and gently opening the valve to the vacuum pump. www.chm.davidson.edu /ChemistryApplets/GasLaws/AvogadrosLaw.html   (759 words)

 Ideal Gas Law In such a gas, all the internal energy is in the form of kinetic energy and any change in internal energy is accompanied by a change in temperature. The ideal gas law can be viewed as arising from the kinetic pressure of gas molecules colliding with the walls of a container in accordance with Newton's laws. A convenient standard quantity is the mole, the mass of gas in grams equal to the molecular mass in amu. hyperphysics.phy-astr.gsu.edu /HBASE/kinetic/idegas.html   (1049 words)

 Chemistry : Chapter 8 : Overview   (Site not responding. Last check: 2007-11-02) The volume of 1 mole of gas at STP is called standard molar volume and has a value of 22.4 L. Because pressure, volume, temperature, and moles are the only variables, if three of the variables are known, the other can be determined. In this equation, R is the gas constant. Since all molecules of gas in a mixture must have the same temperature and volume, the gases are differentiated by the pressure. www.wwnorton.com /chemistry/overview/ch8.htm   (973 words)

 Ideal Gas Properties An ideal gas is a special case of a pure substance in the vapor phase. Since an ideal gas is a special case of a pure substance, the state is specified by giving the values of two properties. Of course, the P-v-T surface for an ideal gas is much simpler that that for the general case of a pure substance. gaia.ecs.csus.edu /~reardonf/thermhtm/idgas.htm   (694 words)

 Useful Tables - Gases   (Site not responding. Last check: 2007-11-02) The volume of a gas maintained at constant temperature and pressure is directly proportional to the number of moles of the gas The proportionality constant is the gas constant, R. The mole fraction of a gas component is equal to the number of moles of the component divided by the total number of moles of gas molecules in the sample. wine1.sb.fsu.edu /chm1045/tables/gases/gases.htm   (281 words)

 Gas Laws In this equation, R is a proportionality constant known as the ideal gas constant and T is the absolute temperature. The ideal gas equation can be used to predict the value of any one of the variables that describe a gas from known values of the other three. Gas law problems often ask you to predict what happens when one or more changes are made in the variables that describe the gas. chemed.chem.purdue.edu /genchem/topicreview/bp/ch4/gaslaws3.html   (3160 words)

 The gas laws and anesthesia Boyle’s law which states: where temperature is constant the volume of a gas is inversely proportional to pressure: V is proportional to 1/P or VP = constant. If a gas (only a gas), such as oxygen, is in a cylinder, the pressure meter attached gives an accurate estimate of the amount of gas contained within. If the pressure in the container is doubled, then the amount of gas dissolved is also doubles, but because of Boyles law (V 1/P), the volume of gas dissolved is halved, so the said volume is the same as it was initially, even though there are twice as many molecules dissolved. www.4um.com /tutorial/science/gas1.htm   (1268 words)

 Gas Laws From this, we derive the molar volume of a gas (volume/moles of gas). Using the Ideal Gas Law, and comparing the pressure of one gas to the total pressure, we solve for the mole fraction. As we stated earlier, the shape of a gas is determined entirely by the container in which the gas is held. www.shodor.org /unchem/advanced/gas   (1034 words)

 CHEMystery: States of Matter: Gases This law states that the pressure of a given amount of gas held at constant volume is directly proporitonal to the Kelvin temperature. The volume of a given amount of gas is proportional to the ratio of its Kelvin temperature and its pressure. The gas particles themselves occupy a net volume so small in relation to the volume of their container that their contribution to the total volume can be ignored. library.thinkquest.org /3659/states/gases.html   (805 words)

 The Ideal Gas Law Info Sheet The Ideal Gas Law can be used similarly to calculate n, V, or T when the appropriate other variable is held constant and/or known. When more than one gas is contained in a vessel, the total pressure of the gases is equal to the sum of the individual or partial pressures. Helium balloons lose their pressure faster than a balloon filled with a large gas such as CO The ratio of the rates of effusion are directly proportional to the square root of the ratio of the densities or the sqaure root of the ratios of the molar masses of the two gases. www.zianet.com /drbill/chem/gas.htm   (1433 words)

 SparkNotes: Ideal Gases: Terms and Formulae C is a constant unique to the amount of gas and temperature. Gas constant - Constant R in the ideal gas law. The ideal gas law is a good approximation when the pressure is low and the temperature is high. www.sparknotes.com /chemistry/gases/ideal/terms.html   (528 words)

 Chem1 Properties of gases: the basic gas laws In an industrial process, a gas confined to a volume of 1 L at a pressure of 20 atm is allowed to flow into a 12-L container by opening the valve that connects the two containers. If a gas contracts by 1/273 of its volume for each degree of cooling, it should contract to zero volume at a temperature of –273°C. This, of course, is the absolute zero of temperature, and this extrapolation of Charles' law is the first evidence of the special significance of this temperature. An ideal gas is defined as a hypothetical substance that obeys the ideal gas equation of state. www.chem1.com /acad/webtext/gas/gas_2.html   (1794 words)

 The behavior of gasses A gas can be characterized by three parameters - the volume of the container that holds it; the pressure it is subjected to; the temperature it is held at. The pressure of a gas is the result of collisions of air molecules with the sides of the container - the more energetic the molecules, the greater the pressure. Recall that K (the "gas constant") was a constant independent of the type, but tied to the volume of the gas. members.tripod.com /w.g.seeley/Q2Q/gasses1.htm   (1410 words)

 gases.htm   (Site not responding. Last check: 2007-11-02) The ideal gas law may also be used to investigate the behavior of a gas when pressure, volume, the moles of gas and/or temperature are changed. Suppose you were given that 8.00 moles of a gas occupies a volume of 4.00L at a constant pressure and temperature. This equation is useful for determining the molar mass of a gas from experimental data, where the mass, pressure, volume and temperature of the gas is measured. www.towson.edu /~ladon/gases.html   (2345 words)

 Chapter 5, Gases Barometer:  Gas pressure (or air pressure) is caused by the collisions of particles over a surface area. V = a n,  at constant pressure and temperature, the volume of a gas is directly proportional to the number of moles. Gas laws predict properties of gases but do not explain why they behave as they do. www.lancaster.k12.oh.us /joe_didomenico/apchem/chapter5/gases.htm   (1178 words)

 AMS Glossary —The constant factor in the equation of state for ideal gases. The gas constant for a particular gas is For moist air, the variable percentage of water vapor is taken into account by retaining the gas constant for dry air while using the virtual temperature in place of the temperature. amsglossary.allenpress.com /glossary/search?id=gas-constant1   (123 words)

 Environmental Protection Agency > Basic Concepts in Environmental Sciences > Module 2 > Ideal Gas Law The ideal gas law is one of the fundamental principles used in calculations involving gas flow in air pollution-related work. This law is used to calculate actual gas flow rates based on the quantity of gas present at standard pressures and temperatures. The ideal gas law is accurate as long as the pressures are relatively similar to normal ambient atmospheric pressures. www.epa.gov /eogapti1/module2/idealgas/idealgas.htm   (711 words)

 Classical Kinetic Theory of Gases: A Crash Review For a gas, "standard conditions" (when a substance is a gas under such conditions) is defined as a temperature of 0°C and a pressure of 1 atm(osphere). NOTE: The derivation of the ideal gas law does assume that gravity is insignificant: that is, it is legitimate to represent the center-of-mass trajectories of the gas molecules between collisions as straight lines. The general technique is to notice that when the volume of a gas increases at constant pressure [say, in an effectively friction-free gas-tight piston], the work done by an increase in volume dV is P dV. www.zaimoni.com /ClassicalGas.htm   (2240 words)

 Gas Laws It is intimately related to the universal gas constant (R) which converts from degrees to conventional units of energy per mole. Some people labor under the impression that since the ideal gas law nicely describes the isobaric scenario (section 1.2), the isentropic scenario (section 1.3) must involve an exception or a breakdown of the ideal gas law. Naming the corollaries to the gas laws is not a terribly big problem; on the scale of things it is trivial compared to the gross misconceptions discussed in section 5. www.av8n.com /physics/gas-laws.htm   (3432 words)

 Ideal Gas Law In perfect or ideal gas the change in density is directly related to the change of temperature and pressure as expressed by the Ideal Gas Law. The Individual Gas Constant - R - depends on the particular gas and is related to the molecular weight of the gas. Gas Mixture Properties Special care must be taken for gas mixtures when using the ideal gas law, calculating the mass, the individual gas constant or the density www.engineeringtoolbox.com /ideal-gas-law-d_157.html   (562 words)

 Gas Laws and Gas Behavior   (Site not responding. Last check: 2007-11-02) He found that for a sample of gas held at a constant temperature, the pressure is inversely related to volume. Thus, for any sample of gas at two different sets of conditions, the quotient of the pressure times the volume, divided by the absolute temperature, is constant. This is a very valuable tool, as one can collect a gas generated by a reaction, record its volume, pressure, and temperature to calculate the number of moles of gas was generated in a reaction. academics.vmi.edu /chem_jt/CH131/gas_laws_and_gas_behavior.htm   (583 words)

 What is gas constant? - a definition from Whatis.com - see also: universal molar gas constant The gas constant, also known as the universal molar gas constant, is a physical constant that appears in an equation defining the behavior of a gas under theoretically ideal conditions. The gas constant is, by convention, symbolized R. The gas constant has been found, by experiment, to have a value of approximately 8.3145 joules per kelvin per mole (J · K whatis.techtarget.com /definition/0,,sid9_gci858191,00.html   (195 words)

 Gas Law: Determination of Gas Constant R for #FirstName# #LastName#   (Site not responding. Last check: 2007-11-02) A gas is a form of matter that consists of a collection of molecules in chaotic, random motion. Unlike a solid or liquid, the molecules of a gas are widely separated, and a gas will expand or contract to fit the container in which it is held. Since a gas is free to expand or contract (it is compressible), the behavior of a gas is susceptible to several factors. icn2.umeche.maine.edu /genchemlabs/GasLaws/gaslaws2.htm   (1538 words)

 Speed of Sound in a Gas - Succeed in Physical Science The speed of sound in a gas is a specific fraction of the average speed of the gas molecules at the given temperature. The speed of sound in any gas is a function of temperature, the molecular structure of the gas and its molecular mass. An interesting characteristic of the speed of sound in a gas is that the speed is a distinct fraction of the average speed or velocity of the molecules or atoms making up the gas. www.school-for-champions.com /science/sound_speed_gas.htm   (1400 words)

 Gas Constant R Using the mass of the magnesium and stoichiometry, you can calculate the amount of moles of hydrogen gas that should have been produced. You will make an experimental determination of the volume that the gas occupies, the pressure of the hydrogen gas and the temperature during the experiment From the mass of the magnesium ribbon, calculate the number of moles of hydrogen gas that should be produced. www.sas.upenn.edu /~tloschia/AP/labs/GasConstant.htm   (408 words)

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