102_final_review_ques_-_revised

102_final_review_ques_-_revised - 12/16/09 Review Problems...

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Unformatted text preview: 12/16/09 Review Problems Exam Details Date: Fr iday December 18, 2009 T ime: 9.00am - 11.30am Rooms : Divisions 9 & 10 - RCH 103, 105, 110, 112 (ever yone else is wr iting in the PAC) Details: 14 multiple choice questions One (1) cheat sheet, both sides calculat or 12/16/09 Review Problems Help Sessions Mar ys help sessions: Mon Dec 7 10am - noon WEEF lab Thurs Dec 17 I f you would like to meet with me at a time other than these, please send me an email : ma2r obin@uwater loo.ca 12/16/09 Review Problems Example 1 A 10.0g mixture of Ba(NO3)2 and AgNO3 was dissolved in water and treated with excess HCl. All of the Ba2+ and Ag+ ions were precipitated as BaCl2 and AgCl, respectively, according to the unbalanced reactions below. 8.3g of chlor ide salts (a mixture of BaCl2 and AgCl) was recovered. The weight percent of Ba(NO3)2 in the or iginal mixture was: A) 8.7 B) 29.1 C) 37.8 D) 58.2 E) 75.6 12/16/09 Review Problems Example 2 What is the vapour pressure (in tor r) above an ideal solution consisting of 15.0g of NaCl dissolved in 100g of wat er at 25 C? Assume that NaCl completely dissociat es in water. Data : vapour pressure of pure water at 25 C is 23.76 tor r A) 1.05 B) 2.01 C) 20.66 D) 21.75 E) 22.71 12/16/09 Review Problems Example 3 When 0.0250g of an unknown compound with an empir ical for mula CH2 is dissolved in 5.00g of benzene (Kf = 5.12 C/m), the freezing point of benzene is depressed from 5.51 C to 5.28 C. What is the molecular for mula of the unknown compound?...
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This note was uploaded on 12/15/2009 for the course ENGINEERIN CHE 102 taught by Professor Soares during the Fall '09 term at Waterloo.

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102_final_review_ques_-_revised - 12/16/09 Review Problems...

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