q4pf09key - 2. 1.60 atm 3. 2.57 atm 4. 8.02 atm 1 g ethanol...

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CH301 Fall 2009 Practice Quiz 4 Answer Key 1. All of the species below have the same bond order except for one. Which is it? 1. C 2 3+ 2. H 2 - 3. F 2 + 4. O 2 3- 5. Ne 2 + All of the species have a bond order of 0.5 except for F 2 + , whose bond order is 1.5. 2. Which of the species below is the most paramagnetic? 1. O 2 - 2. C 2 3. N 2 + 4. B 2 5. Li 2 - Diboron has two unpaired electrons. Al of the other species have either zero or one. 3. Rank the following species from longest to short bonds based on bond order: O 2 + , He 2 + , B 2 - , F 2 , C 2 . 1. B 2 - > He 2 + > F 2 > C 2 > O 2 + 2. B 2 - > He 2 + > F 2 > O 2 + > C 2 3. He 2 + > F 2 > B 2 - > C 2 > O 2 + 4. He 2 + > F 2 > B 2 - > C 2 > O 2 + 5. F 2 > He 2 + > B 2 - > C 2 > O 2 + The species O 2 + , He 2 + , B 2 - , F 2 and C 2 have bond orders of 2.5, 0.5, 1.5, 1 and 2 respectively. 4. Consider the reaction below. If one 1 g of ethanol (CH 3 CH 2 OH) is completely combusted and the products are collected in a 0.5 L vessel, what will the pressure be inside that vessel at 450 K? CH 3 CH 2 OH(l) + 3 O 2 (g) 3 H 2 O(l) + 2 CO 2 (g) 1. 5.84 atm
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Unformatted text preview: 2. 1.60 atm 3. 2.57 atm 4. 8.02 atm 1 g ethanol (1 mol/46.07 g) = 0.0217 moles ethanol. this will produce 0.1085 moles of gaseous products. PV = nRT P = nRT/V = 0.1085*0.0821*450/0.5 = 8.02 atm 5. A sample of gas stored at 25 C has a pressure of 2.50 atm. If the temperature is increased to 50 C, what will the new pressure be? 1. 2.71 atm 2. 5.00 atm 3. 1.25 atm 4. 2.31 atm 2.5 atm (323 K / 298 K) = 2.7 atm 6. According to kinetic molecular theory, which of the following factors will affect the velocity of a gas molecule? I. the system's temperature II. the molecule's dipole III. the molecule's mass 1. I only 2. II only 3. III only 4. I and II 5. I and III 6. II and III 7. I, II and III E = kT = mv 2 v = (kT/m) Only the mass of the molecule and the temperature of the system define the molecules velocity....
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q4pf09key - 2. 1.60 atm 3. 2.57 atm 4. 8.02 atm 1 g ethanol...

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