Perfect gases - states of matter, Chemistry

A gas is a fluid. It has no resistance to change of shape and will expand indefinitely to fill any container in which is held. The molecules or atoms which make up a gas interact only weakly with each another. They move rapidly, and collide randomly and chaotically with one another. The physical properties of a perfect gas are completely described by four parameters which, with their respective SI units are:

?The amount of substance of which it is comprised, n, in moles;

?The temperature of the gas, T, in Kelvin;

?The pressure of the gas, p, in Pascal;

?The volume occupied by the gas ,V, in m3.

The perfect gas equations

Several separate gas laws were independently developed:

 Boyle's law:    p.V=constant               (at constant temperature)

Charles' law:   1680_gases.png                     (at constant pressure)

Avogadro's principle:  1631_gases1.png         (at constant pressure and temperature)

These three laws are combined in the perfect gas equation of state (also known as the ideal gas law or the perfect gas equation)

The perfect gas equation

pV=nRT

The four parameters of perfect gas are not independent and the relations between parameters are expressed in the gas laws. The perfect gas laws are unified into a single equation of state for a gas which fully expresses the relationships between all four properties. These relationships, however, are based on approximations to experimental observations and only apply to a perfect gas.

Partial pressure:

The pressure of a mixture of gases in a particular volume is the sum of the partial pressure of each individual constituent gas, with the partial pressure of each gas being the pressure that it would exert if it alone occupied the same volume. Dalton's law is strictly true only for ideal gases

The total pressure exerted by a mixture of ideal gases is related to the partial pressures through Dalton's law, which may be illustrating as:

"The total pressure exerted by a mixture of ideal gases in a volume is equal to the arithmetic sum of the partial pressures".

1885_partial pressure.png

Fig.1. Graphical representations of the ideal gas equations. (a) Boyle's law; (b) Charles' law;(c) The surface

Posted Date: 7/20/2012 3:10:09 AM | Location : United States







Related Discussions:- Perfect gases - states of matter, Assignment Help, Ask Question on Perfect gases - states of matter, Get Answer, Expert's Help, Perfect gases - states of matter Discussions

Write discussion on Perfect gases - states of matter
Your posts are moderated
Related Questions
Q. Important applications of indium? The most important applications of indium are in protection of bearings against wear and erosion in low melting alloys and in electronic de

What is the equation for the reaction of sodium nitroprusside with a ketone

Gustation - The Sense of Taste The word ‘taste' means not only a sensory response to the soluble materials in the mouth but also aesthetic appreciation. It has been noted many

how many methods to remove color impurities in chemical compounds?

Show by means of equations and reagents, how the following conversion would be achieved? Propyne to butanoic acid

Sources of antioxidants The primary biological role of antioxidant is in preventing the damage that reactive free radical can cause to cells and cellular compounds. In fact, al

Define the following observations: (i) Most of the known noble gas compounds are those of xenon. (ii) CIF3 exists but FCI 3 does not. (iii) Between the hydrides of elemen

Because Mg is metal. We know from the properties of the metal it will mallable, ductile, and good conductor for electricity. So, for better conduction the conduction band must over

list down all the chemical properties of s- block?

Physical properties Alkyl Halides (i) CH 3 F,CH 3 Cl, CH 3 Br and C 2 H 5 Cl are gases at room temperature. The alkyl halides up to be colourless liquids whereas higher members