Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
Determine which equation (law) you will use: Boyle's, Charle's, Combined Gas or Avogadro's. Then solve and show your work.
![Chemistry 151
Week 9- Introduction to Gases
4. The total pressure in a 11.2-L automobile tire is 32.0 psi at 25.0°C. What is the new pressure in the tire
if its temperature increases to 34.5 °C and the volume changes to 14.5 L?
5. If we have a sample of gas at 1.18 atm and 67.4 °C what would happen to the temperature if the
pressure
is increased to 3.62 atm? Calculate this temperature, assuming the volume stays constant at 2.00 L.
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![Chemistry 151
Week 9- Introduction to Gases
POST-LABORATORY QUESTIONS:
To solve each of the problems below, first determine the equation you will need from the Introduction
section of this lab.
1. If a gas occupies 3.2 L at 1.50 atm, what will be the pressure if the volume is increased to 15.4 L?
bas in
2. A certain gas held at a temperature of 31.2 °C holds a volume of 458 mL. If the temperature is changed
to 55.0 °C, what will be the volume of the gas?
UTS
10gnol ori
Lomi do
won on
(ma) omuloV
000
028
3. If3.4 moles of gas are contained in a volume of 2.25 L, what is the new volume if1.8 moles are added to
the container? (Hint: if gas is added to the container, then the final number of moles (n2) includes BOTH
the initial 3.4 moles AND the added 1.8 moles.)
10 te0o ni doni omuloy bre nneuque wd gidenounlar i 1nW X
atelnnu
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