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Unformatted text preview: APSC 132] —QUIZ #1: RE WE WAND INTRODUCTORY HERMOD YNAMICS Name: Mark: /25 Student No. Question 1 (8 marks) To prepare for their examination, a few members 'of the illustrious J FORCE — the living legends of the Queen ’5 University campus - required a stimulant, caffeine from a very strong cup of coffee, to stay on task and ace their chemistry quiz. One member of the force did an analysis of the caffeine and found that it contained 49.48% carbon, 5.15°/o_ - hydrogen, 28.87% nitrogen, and 16.49% oxygen by mass. If the molar mass of caffeine is 194.2 g/mol, find the molecular formula of caffeine. 3 a i Question 2 (8 marks) Nitrogen gas (N2) can be prepared by passing gaseous ammonia gas (NH3) over solid copper(II) oxide (CuO) at high temperatures. The other products of the reaction are solid copper (Cu) and water. Write a balanced chemical equation for this reaction. If 18.1 g of NH3(g) is reacted with 90.4 g of CuO(s), what mass of N2(gas) would be produced? @ Maggi Norma) my» My) +3cq(s)+3/M9) :34”! h=?o.'/~J / 7:0 """" Question 3 (9 marks) Calculate the change in entropy that occurs when a sample containing 2.00 mol of water is heated from 500°C to 150°C at 1 atm pressure. The molar heat capacities for liquid water and gaseous water are 75.3 J/Kmol and 36,4 J/Kmol respectively, and the enthalpy of vaporization for water is 40.7 kJ/rnol at 100°C. Hint: pay particular attention to your units. 5 I; (W 7‘70 #L0 50.0% ~43 lama; AS! = 37} 323 = z /. 7 {37,3 @ : m"Mr/7 ': 373 K \\ AS : (ZwM/‘Ofxw‘ef/MK) , 2 2-/%X30LJ/K_ @ S ' 3'3 :31.- W 740 W41, MCCWC—a /50.0"c a $3 ; (Lama/(36 LAT/MK) (Ln 3%” ; % /{J”//<_ “Ma-m ... 9 00 4337.?ng AS! +4253,“ 1—» £333 = 2/. + 4,. ?,/5_:F;jjé ""1 2W? f/kf ...
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This note was uploaded on 12/01/2010 for the course APPLIED SC 131 taught by Professor Professornewstead during the Fall '09 term at Queens University.

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