Download CHEM 103 Exam 1b - Neutralization Reactions and Empirical Formulas and more Exams Chemistry in PDF only on Docsity! CHEM 103 Hour Exam 1b 1 March 2001 11:00 A.M. Dr. Miller NAME_____ SECTION 3 2 _ Discussion TA: Rebecca Shama SHOW ALL OF YOUR WORK! If you must continue your work on a problem in another place, please indicate in the space provided for the question where your work is continued. Clearly mark you answers. You may remove the periodic table attached as the last page of the exam if you wish, but please do NOT separate the pages of the exam. POSSESSION OF THIS EXAM OUTSIDE OF C-1407 ON 1 MARCH 2000 is NOT PERMITTED. Please remain in your seats until the exam is over. 1. 2. 3. 4. 5. 6. 712 712 717 717 727 715 TOTAL 7100 1. (12 pts) Calculate the volume, in ml, of 0.2255M NaOH required to neutralize 50.00 mL of 0.1616 M H2SO4 . 4. (17 pts) When Joe added 25.00 ml of 0.4555 M Fe(NO3 ) 3 to a solution containing excess Na2 S, how many grams of crystalline Fe2 S 3 should he have obtained? 5. (27 pts) Fill in the missing information, a. Number of protons in ^Zn b. Number of electrons in Ca2+ c. Number of neutrons in 25 d. Name of the HPO42 ion ____________________ ion e. Name of the compound HgCO3 ____________________ f. Empirical formula of the compound C22 H 14O6 _____________ g. Moles of (NH4)2SO4 in 442.5 ml of 0.4322 M (NH4)2SO4. __________ h. [K+ ] in 345.0 ml of 0.2424 M K2CO3 __________M i. Most soluble of these salts: PbCI 2 ; A&S ; Na2CO3 ; Ca3(PO4) 2 __________ 6. (15 pts) A compound is found to be 20.75% iron, 15.67% silicon, and 63.58% fluorine. Determine the empirical formula of this compound. PERIODIC TABLE I 6 ] ^ 2: i i 3< * I 8 t ( 13 5 I (2 3 jl 94 1 la 3.0 19 K ?.l 57 tb 5.5 55 :s 2.9 *7 ?r 23) 4 Be 9.01 12 Mg 24.3 20 Ca 40.1 38 Sr 87.6 56 Ba 137.3 88 Ra (226) 21 Sc 45.0 39 Y 88.9 57 La 138.9 89 Ac (227) 22 Ti 47.9 40 Zr JM.2 72 Hf 178.5 104 Rf (259) 23 V 50.9 41 Nb 92.9 73 Ta 180.9 105 Db 24 Cr 52.0 42 Mo 95.9 74 w 183.9 106 Sg 25 Mn 54.9 43 Tc (97) 75 Re 186.2 107 Bh 26 Fe 55.8 44 Ru 101.1 76 Os 190.2 108 Hs 1 H 1.008 27 Co 58.9 45 Rh 102.9 77 Ir 192.2 109 Mt 28 Ni 58.7 46 Pd 106.4 78 Pt 195.1 29 Cu 63.5 47 Ag 107.9 79 All 197.0 30 Zn 65.4 48 Cd 112.4 80 Hg 200.6 5 B 10.8 13 Al 27.0 31 Ga 69.7 49 In 114.8 81 Tl 204.4 6 c 12.01 14 Si 28.1 32 Ge 72.6 50 Sn 118.7 82 Pb 207.2 7 N 14.01 15 P 31.0 33 As 74.9 51 Sb 121.8 83 Bi 209.0 8 o 16.00 16 S 32.1 34 Se 79.0 52 Te 127.6 84 Po 209 ] 1< 1 ( 3. E 7 c 12 I / (2 9 F ?.o 7 :i 5.5 $5 tr 5.9 53 I 6.9 55 U 10) 2 He 4.00 10 Ne 20.2 18 Ar 39.9 36 Kr 83.8 54 Xe 131.3 86 Rn (222) 58 Ce 140.1 59 Pr 140.9 60 Nd 144.2 61 Pm (147) 62 Sm 150.4 63 Eu 152.0 64 Gd 157.3 65 Tb 158.9 66 Dy 162.5 67 Ho 164.9 68 Er 167.3 69 Tm 168.9 70 Yb 173.0 71 Lu 175.0 90 Th 232.0 91 Pa (231) 92 U 238.0 93 Np (237) 94 Pu (244) 95 Am (243) 96 Cm (248) 97 Bk (247) 98 Cf (251) 99 Es (254) 100 Fm (257) 101 Md (258) 102 No (255) 103 Lr (257)
