4. Which of the following systems will have the greatest volume at STP? a. 1.00 g N2 (MM = 28 g/mol) b. 1.00 g NH3 (MM = 17 g/mol) c. 1.00 g He (MM = 4 g/mol) d. 1.00 g CO2 (MM = 44 g/mol) 5. Which of the following will contain the greatest number of molecules at 300K and 1 atm pressure? a. 0.01 L b. 0.10L c. 1.00 L d. 10.0L 6. How much carbon dioxide is there in a 3.4 L balloon at SATP? a. 0.13 g b. 6.1 g c. 0.15 mol d. 6.6 g 7. In the reaction 2H2 + O2 (e O H2O0, how many liters of oxygen gas at STP will be needed to react with 10 L of hydrogen gas at STP? c. 5.00 L d. 100 L a. 20.0 b. 10.0 L 8. Which of the following postulates of the Kinetic Molecular Theory for gases explains why gases exhibit pressure? a. The molecules are in constant random motion b. The distance between the molecules is great c. The molecules collide with the walls of the vessel d. The molecular kinetic energy depends on the temperature. 9. How will a velocity of a gas molecule vary if its molecular weight is increased from 32 g/mol to 64 g/mol? a. It will increase. b. It will decrease. h0. Which of the following gases is the fastest: He, O2, CO2, NH;? a. O2 b. CO2 c. It will double. d. Nothing happens. с. Не d. NH3
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.
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