Calculate the root mean square velocity for the NO2 molecules in a sample of NO2 gas at 11.8°C. (R = 8.3145 J/K mol) 0.392 m/s 7104 m/s 392.9 m/s 471.2 m/s QUESTION 7 The valve between the 3.00-L bulb, in which the gas pressure is 1.20 atm, and the 2.00-L bulb, in which the gas pressure is 3.30 atm, is opened. What is the final pressure in the two bulbs, the temperature remaining constant? 2.46 atm 1.98 atm 0.480 atm 2.04 atm QUESTION 8 A 6.59-g sample of Copper nitrate, Cu(NO3)2, molar mass = 187.56 g/mol, is heated in an evacuated cylinder with a volume of 3.39 L. The salt decomposes when heated, according to the equation: Cu(NO3)2(s) → CuO(s) + NO2(g) + O2(g) Assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a temperature of 27°C? Assume the CuO(s) takes up negligible volume. 0.638 atm 0.449 atm 0.0598 atm 0.559 atm QUESTION 9 The conditions for standard temperature and pressure (STP) are. 273 K, 1 atm 0°C, 10 atm 0 K, 1 atm 273 K, 0.5 atm QUESTION 10 A sample of oxygen gas occupies 450ml at 298K. IF the container the oxygen is in is expanded to 2.75L at constant pressure, what is the final temperature for the oxygen at this new volume? 1821°C 1721°C 1450°C 1548°C
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.
QUESTION 6
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Calculate the root mean square velocity for the NO2 molecules in a sample of NO2 gas at 11.8°C. (R = 8.3145 J/K mol)
0.392 m/s
7104 m/s
392.9 m/s
471.2 m/s
QUESTION 7
-
The valve between the 3.00-L bulb, in which the gas pressure is 1.20 atm, and the 2.00-L bulb, in which the gas pressure is 3.30 atm, is opened. What is the final pressure in the two bulbs, the temperature remaining constant?
2.46 atm
1.98 atm
0.480 atm
2.04 atm
QUESTION 8
-
A 6.59-g sample of Copper nitrate, Cu(NO3)2, molar mass = 187.56 g/mol, is heated in an evacuated cylinder with a volume of 3.39 L. The salt decomposes when heated, according to the equation:
Cu(NO3)2(s) → CuO(s) + NO2(g) + O2(g)
Assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a temperature of 27°C? Assume the CuO(s) takes up negligible volume.
0.638 atm
0.449 atm
0.0598 atm
0.559 atm
QUESTION 9
-
The conditions for standard temperature and pressure (STP) are.
273 K, 1 atm
0°C, 10 atm
0 K, 1 atm
273 K, 0.5 atm
QUESTION 10
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A sample of oxygen gas occupies 450ml at 298K. IF the container the oxygen is in is expanded to 2.75L at constant pressure, what is the final temperature for the oxygen at this new volume?
1821°C
1721°C
1450°C
1548°C
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