Mid1-ExamA

Mid1-ExamA - First Letter of last name Chem 1B Midterm 1...

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Unformatted text preview: First Letter of last name Chem 1B Midterm 1 (exam A), Winter 2006 Name; L4!!!le TXgfl Sal/9401) Perm' This exam should contain 7 pages (this cover sheet, 4 pages of exam, one sheet of information and a periodic table). Please count to make sure your exam is complete with no blank pages. You have 50 minutes to complete the exam. Show all work and box your final answer to receive maximum possible credit. The exam is out of a total of 100 points. Good luck! Exam 1 p. 1 Chem. 1B 2006 1) (30 points total) a) (3 pts.)Which of the following is always positive when a spontaneous process occurs? Circle the correct answer. ASuniverse AGsystem AS surroundings Astystem I . A solid melts at 1 atm pressure and its normal fusion temperature. Circle the correct answer for each quantity (ASunw, AH, AG): ASunw>O ASunw<O @ @ AH<0 AH=0 AG>0 AG<O @ c) (6 pts.) A sample of carbon dioxide gas is cooled from 50 0C to 0°C at constant pressure of 1 atm. Circle the correct answer for each quantity (q,w, AE): q>0 & q=0 w<0 a w=0 @ AE>0 AE=0 d) (4 pts.) Predict the sign for AH and AS for the following reaction: H2 (g) 9 2H (g) AS>9 AS<0 AS=0 AH> AH<0 AH=0 e) (5 pts.) Write the balanced equation that corresponds to the standard heat of formation, AH}, of aluminum oxide, AlZO3(s). 2/4/(5) + gimp/7 45 g (5) f) (6 pts.) In old textbooks you will find the first law of thermodynamics written as AE=q—w. With this sign convention, what does “w” mean? (Do not say “work”. Be more specific.) Vw‘ WM 0‘4 724' I‘m/[rm WM 1” Exam 1 p. 2 Chem. 18 2006 2) (20 points total) a) (15 pts.) Given the following data, calculate the normal boiling point for formic acid (HCOOH). AHfo (kl/mol) S° (J/mol K) HCOOH(l) -410 130 HCOOH(g) -363 251 C7 , W006! was /7[[00/vl(3) 15$wang «Alé 2&1) :4Q}kf A5°= Sow — fag-(1) 11M 5%)4 b) (5 pts.) At what temperatures will gaseous formic acid spontaneously condense into liquid formic acid? Alf—@520 0m % swat (5H‘15WC) F K c o ‘ / [/QPo/I q (\G’l emm 5m New >0 ’4 m five/S“— \. Exam 1 p. 3 Chem. 1B 2006 3) (25 pts.) 2 moles of aluminum are heated to 98.7 °C and then placed in a calorimeter containing 395g of water (cwater = 4.18 J/ g 0K) at 22.5 0C. The system comes to equilibrium at a temperature of 24.5 0C. What is the specific heat capacity of aluminum? M, (H A/fl'l 4.06/3; 0 (it—0 Exam 1 p. 4 Chem. 1B 2006 4)(25 pts.) One mole of an ideal gas is compressed isothermally and reversibly at 607.4K from 5.60 am to 8.90 atm. Calculate q,w,AH,AS,AV. Put your final answers in the table below, but make sure to show all work. AH >135 +APV >§q457+marrgwaT f2 DgSZ’L" : “32.39:! : £5,273; 7’ gawk if 570/ 0k DV:HIIT : W/XflO?JoCL.?/~1XéoZy°/( / ~_//_\ ‘ &??/a 5.647 :22: ...
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Mid1-ExamA - First Letter of last name Chem 1B Midterm 1...

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