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Unformatted text preview: CHEMISTRY 102/112, Spring 2008 First Examination DO NOT BEGIN TO WORK ON THE EXAMINATION UNTIL THE PROCTOR TELLS YOU TO DO SO! INSTRUCTIONS : Before you begin the examination, please fill-in the identification information requested on the answer sheet. You must use a No. 2 pencil to fill in this information. In the STUDENT ENROLLMENT SHEET section of the form, fill in the I.D. NUMBER (your person number, format = 12345678--, i.e. Left adjusted with two blank spaces on the right), NAME (your last name, first name, M.I.) and CODE (your recitation section code, format = ab) fields. Be sure to fill in the correct circles completely. Your examination score cannot be credited to the correct person if the computer cannot read the bubbled in information. In the SCORE SHEET section of the form, sign your name on the line for NAME. Check that you have a complete examination. This examination includes this instruction page, pages of questions, a periodic table and a table of constants, and a page of equations. For each question on the examination, you are to fill in the circle on the answer sheet that corresponds to the BEST answer. Make sure the answer number used is the same as the question number! Use a No. 2 pencil; make heavy marks that fill-in the circle; erase completely any answer you wish to change. Questions with more than one answer marked will be graded as incorrect. Do not leave any answers blankguess if you dont know. Do not make any stray marks on the answer sheet! Use the space between the problems on the examination pages for your scratch work. Raise your hand if you have a question or need a pencil. PLEASE READ AND THEN SIGN THE ACADEMIC HONESTY STATEMENT BELOW. I hereby certify that the answers given to this examination represent my own unaided work. Signature ____________________________ Key A, Person Number __ __ __ __ - __ __ __ __ Printed Name _________________________ Recitation Section Code __ __ First last THIS FORM MUST BE TURNED IN WITH YOUR ANSWER SHEET AT THE END OF THE EXAMINATION OR THE ANSWER SHEET WILL NOT BE GRADED 2 Part I. Each of the 12 questions in this section is worth 3 pts. (36 pts.) 1. Pentane and hexane form an ideal solution. At 25 C, the vapor pressures of pure pentane and hexane are 511 torr and 145 torr, respectively. A solution is prepared by mixing 1.00 moles of hexane with 2.00 moles of pentane. What is the vapor pressure of the resulting solution? A) 267 torr B) 328 torr C) 389 torr D) 656 torr E) 1167 torr 2. A sample of KNO 3 (49.0g) is completely dissolved in 101 g of water at 100 C with precautions to avoid evaporation of any water. The solution is then cooled to 30 C. A small amount of precipitate is observed. The solution at 30 C is _________....
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