exam2 - City College, Chemistry Department Chemistry 10301,...

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City College, Chemistry Department Chemistry 10301, sections E* Prof. T. Lazaridis Second Midterm exam, Nov. 3, 2010 Last Name: _____________________________________________ First Name: _____________________________________________ SSN l ast 4 : ______________________________________________ Note: There are 7 questions in this exam. 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. There is a datasheet containing information that may or may not be needed to answer these questions. SHOW WORK! 1. (20) a. (5) An experiment requires 250 mL of 1.0 M HNO 3 solution. All you have available is a bottle of 6.0 M HNO 3 . How would you prepare the desired solution? Vc = MdVd/Mc = 1.0 M * 250 mL / 6.0 M = 41.7 mL b. (5) A system absorbs 77.5 kJ of heat while doing 63.5 kJ of work on the surroundings. What is the change in its internal energy? Δ E= q + w = 77.5 -63.5 = +14 kJ c. (5) Determine the oxidation number for the indicated element in each of the following substances: C in COCl 2 : +4 S in S Ο 3 : +6 Mn in MnO 4 - : +7 Br in HBrO : +1 As in As 4 : 0 O in K 2 O 2 : -1
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d. (5) Using data from your data sheet calculate the enthalpy of the thermite
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exam2 - City College, Chemistry Department Chemistry 10301,...

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