5.3 A sample of gas (1.9 mol) is in a flask at 21°C and 697 mmHg. The flask is opened and more gas is added to the flask. The new pressure is 782 mmHg and the temperature is now 26°C. There are now. gas in the flask. A) 1.6 B) 2.1 C) 2.9 mol of D) 3.5 E) 0.28 SECTION 6 6.1 Of the following transitions in the Bohr hydrogen atom, the, lowest-energy photon. A) n = 1n = 6 B) n = 6 →n= 1 C) n = 6-n = 3 D) n = 3 →n = 6 E) n = 1-n = 4 transition results in the emission of the 6.2 The uncertainty principle states that A) matter and energy are really the same thing B) it is impossible to know anything with certainty C) it is impossible to know the exact position and momentum of an electron D) there can only be one uncertain digit in a reported number E) it is impossible to know how many electrons there are in an atom 6.3 Which of the subshells below do not exist due to the constraints upon the angular momentum quantum number? A) 4f B) 4d C) 4p D) 4s E) none of the above 6.4 Which of the following is a valid set of four quantum numbers? (n, 4, m, m.) A) 2, 1, 0, +1/2 B) 2, 2, 1, -1/2 C) 1, 0, 1, +1/2 D) 2, 1, +2, +1/2 E) 1, 1, 0, -1/2
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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