solution_pdf - Version 018 Exam 3 McCord (53130) 1 This...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Version 018 Exam 3 McCord (53130) 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. McCord CH301tt This exam is only for McCords Tues/Thur CH301 class. PLEASE carefully bubble in your UTEID and Version Number! 001 10.0 points At 25 C and 0.5 atm, which has the highest vapor pressure in a closed 3 liter container? 1. 2.5 liters of water 2. 2 liters of water 3. 2.99 liters of water 4. They all have the same vapor pressure. correct Explanation: 002 10.0 points Consider the following molecular orbital di- agram: a b c What are the names of the labeled orbitals, a , b , and c , respectively? 1. 2 p , 2 p , 2 s 2. 2 p , 2 p , 1 s 3. 2 p , 2 p , 2 s 4. 2 p , 2 p , 2 s correct 5. 2 p , 2 p , 2 s Explanation: 003 10.0 points It is possible for a molecule to have a negative bond order. 1. false correct 2. true Explanation: bond order = #elec bond- #elec antibond 2 Two atomic orbitals form an equal num- ber of bonding and nonbonding orbitals. The bonding orbital has lower energy than its cor- responding antibonding orbital and receives 2 electrons before the antibonding orbital re- ceives any, and so bonding order will always be zero or positive. 004 10.0 points How many moles of HCl gas are produced if 5.00 L of Cl 2 and excess H 2 are reacted at STP? H 2 + Cl 2 2 HCl(g) 1. 8.96 mol 2. 224 mol 3. 0.446 mol correct 4. 0.223 mol 5. 112 mol 6. 0.0112 mol Explanation: Version 018 Exam 3 McCord (53130) 2 V Cl 2 = 5.00 L At STP we can use the standard molar volume, 22 . 4 L mol , to convert L of Cl 2 to moles of Cl 2 : 5 . 00 L mol 22 . 4 L = 0 . 223 mol Cl 2 Now calculate moles of H 2 : ? mol H 2 = 0 . 223 mol Cl 2 2 mol HCl 1 mol Cl 2 = 0 . 446 mol 005 10.0 points The theory used to explain the behavior of solids, liquids and gases is 1. the atomic theory. 2. the VSEPR theory. 3. the kinetic-molecular theory. correct 4. the molecular theory. Explanation: 006 10.0 points A 6.35 L sample of carbon monoxide is col- lected at 55.0 C and 0.892 atm. What volume will the gas occupy at 1.05 atm and 59.0 C? 1. 6.68 L 2. 1.96 L 3. 6.10 L 4. 5.46 L correct 5. 4.82 L Explanation: V 1 = 6 . 35 L P 1 = 0 . 892 atm T 1 = 55 C = 328 K P 2 = 1 . 05 atm T 2 = 59 C = 332 K We can use the combined gas law and solve for V 2 : P 1 V 1 T 1 = P 2 V 2 T 2 V 2 = P 1 V 1 T 2 T 1 P 2 = (6 . 35 L) (0 . 892 atm) (332 K) (328 K) (1 . 05 atm) = 5 . 46 L 007 10.0 points If equal weights of O 2 and N 2 are placed in separate containers of equal volume at the same temperature, which one of the following is true?...
View Full Document

This note was uploaded on 02/02/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

Page1 / 8

solution_pdf - Version 018 Exam 3 McCord (53130) 1 This...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online