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

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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 = ½·k·T = ½·m·v 2 v = (k·T/m) ½ 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(1...

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