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practiceexam21 - City College Chemistry Department...

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City College, Chemistry Department Chemistry 10301, sections T, T2, Τ 3 Prof. T. Lazaridis Second Midterm exam, Oct 29, 2009 Last Name: _____________________________________________ First Name: _____________________________________________ SSN l ast 4 : ______________________________________________ Note: There are 7 questions in this exam (check both sides of the sheet). Fill in your answer in the blank space provided immediately following each question. 1/2 point will be subtracted every time you report a numerical result with an incorrect number of significant figures. The last 3 sheets of this exam contains information that may or may not be needed to answer these questions. SHOW WORK! 1. (18) a. (6) What volume of a 0.2000 M K 2 Cr 2 O 7 solution do we need in order to prepare 100 mL of 0.0400 M K 2 Cr 2 O 7 solution? McVc = Md Vd => Vc = (0.0400 M X 100mL) / 0.2000 M = 20 mL b. (6) We have a sample of gas at 285 o C. To what Celsius temperature must the gas be heated to double its pressure if there is no change in the volume of the gas? Ti= 285 + 273 = 558 K Pf = 2 Pi PiV = nRTi => Ti/Tf = Pi/Pf= ½ => Tf = 2 Ti = 1116K , or 843 o C Pf V= nRTf c. (6) Assign oxidation numbers to N in each of the following compounds: N 2 : 0 ΝΟ 2 : +4 N 2 O 3 : +3 HNO 2 : +3 N 2 H 4 : -2 NH 3 : -3
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