Law, Gay-Lussac

Joseph Louis Gay-Lussac, Memoir on the combination of gaseous substances with each other, [1809]. Quoted in Leicester and Klickstein, Source Book in Chemistry, 298. See M.R Crosland, The origins of Gay-Lussacs law of combining volumes, Ann. Sci, 17 (1961) 1-26. 

Gay-LussacS law is true only for separate gases and only when their temperatures as well as their pressures are all equal. 

Vibrational spectroscopy is successfully employed to quantitative analysis of gases, especially if real time and on-line analyses are needed. In order to compensate the effects of pressure broadening, it is worthwhile to carry out all measurements at the same total pressure. To this end, the sample is placed in an inert gas, such as nitrogen or a noble gas, and the pressure raised to a defined value. The partial pressure instead of the concentration is used in the Lambert-Beer law. The calibration curve is valid only at the calibration temperature. If the temperature of the sample deviates from this temperature, the partial pressure has to be corrected by the Gay-Lussac law. 

At other temperatures and pressures, the weight of a litre of chlorine varies according to the Boyle-Gay-Lussac law. From the following formula the weight of I litre of any gas may be calculated at temperature t and pressure h, from a knowledge of the value at o° C. and 760 mm. ... 

TTie above observations obey the Gay-Lussac Law which states that a compound that crystallises from a highly super-saturated solution first is the most soluble (from a saturated solution first it is the least soluble). In the above case, amorphous (2) is more soluble than (1). By choice of crystal habit modifier, it is possible to preferentially precipitate one form of the phosphate. 

Gay-Lussac law Joseph-Louis Gay-Lussac (Erance) proposes that... 

Gay-Lussac — Law of Gaseous Volumes — Iodine — Balard — Berthier. 

Historically, there was a competition between England and France, which had the effect in science of development of English units stiU used in the United States and the metric system developed in France and preferred in modem science. Thus, it is interesting that early work by Charles on the temperature dependence was extended by Gay Lussac several years later and is now known as the Charles-Gay Lussac law. 

Gay[Pg.188]

Charles s law, which is a quite difTerent law, is also sometimes referred to as Gay-Lussac s law. 

Charles law, also known as Gay-Lussac s law, states that the volume of a given mass of gas varies directly as the absolute temperature if the pressure remains constant, that is. 

The interaction forces which account for the value of a in this equation arise from tire size, the molecular vibration frequencies and dipole moments of the molecules. The factor b is only related to the molecular volumes. The molar volume of a gas at one atmosphere pressure is 22.414 ImoD at 273 K, and this volume increases according to Gay-Lussac s law with increasing... 

Charles and Gay-Lussac, working independently, found that gas pressure varied with the absolute temperature. If the volume was maintained constant, the pressure would vary in proportion to the absolute temperature [I j. Using a proportionality constant R, the relationships can be combined to form the equation of state for a perfect gas, otherwi.se known as the perfect gas law. 

Perhaps the first stoichiometric relationship to be discovered was the law of combining volumes, proposed by Gay-Lussac in 1808 The volume ratio of any two gases in a reaction at constant temperature and pressure is the same as the reacting nude ratio. 

Charles s and Gay-Lussac s law Relation stating that at constant P and n, the volume of a gas is directly proportional to its absolute temperature, 106-107, 111 Chelating agent Complexing ligand that forms more than one bond with a central metal atom the complex formed is called a chelate, 411-412 natural, 424-425 synthetic, 424-425 Chemical equation Expression that describes the nature and relative amounts of reactants and products in a reaction, 60-61. See also Equation, net ionic. 

If the pressure is maintained constant, the volume is found to increase by approximately the same fraction of the volume at 0° C, for each degree rise of temperature (law of Dalton and Gay-Lussac) ... 

Summaries of the properties of gases, particularly the variation of pressure with volume and temperature, are known as the gas laws. The first reliable measurements of the properties of gases were made by the Anglo-Irish scientist Robert Boyle in 1662 when he examined the effect of pressure on volume. A century and a half later, a new pastime, hot-air ballooning, motivated two French scientists, Jacques Charles and Joseph-Louis Gay-Lussac, to formulate additional gas laws. Charles and... 

Gay-Lussac s name is sometimes associated with the law, but Charles s law is now more common. 

This is a limiting reactant problem. Due to Gay-Lussac s Law, we can work directly in volumes instead of moles. 

In order to work out reacting volumes of gases, we can use Gay-Lussac s law of combining volumes When gases react they do so in volumes which bear a simple ratio to each other and to the volumes of the products if they are gases, all measurements of volume being at the same temperature and pressure . 

This is one form of Charles s law . (Charles s law is also called Gay-Lussac s law .) Alternatively, we could have multiplied both sides of Equation (1.4) by T, and rewritten it as... 

Gay-Lussac s law describes the relationship between the pressure of a gas and its Kelvin temperature if the volume and amount are held constant. Figure 8.5 represents the process of heating a given amount of gas at a constant volume. 

In the discussion of Boyle s, Charles s, and Gay-Lussac s laws we held two of the four variables constant, changed the third, and looked at its effect on the fourth variable. If we keep the number of moles of gas constant—that is, no gas can get in or out—then we can combine these three gas laws into one, the combined gas law, which can be expressed as ... 

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