Exam 2 Redo - ft») Rockley, Fall 2011, Chem.1314 Exam #2...

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Unformatted text preview: ft») Rockley, Fall 2011, Chem.1314 Exam #2 Redo Form B. Page 2 of 8. 1. In a combination reaction, 2.22 g of elemental magnesium solid is heated with 3.75 g of elemental nitrogen gas . How many moles of excess reagent remain? F.W. ofMg = 24.31, N = 14.01 1,".‘2‘2. 4337‘?" A 2'90 “i: M t 74/ M 2x77... /l/ B 0.853 W 67 "L I 2 C 6.41 r 1, 12.02. a @731 0.103 E None of these is within 10% of the correct answer 2. If 72.5 g of aluminum nitrite and 58.6 g of ammonium chloride react according to the following equation, how many grams of excess reagent remain? Equation is balanced! Formula masses: AI(N02)3 = 165.01 g/mol NH4CI = 53.49 g/mol 7’? ‘37 I"? >23 Al(NOz)3 + 3NH4C| 9 AICl3 + 3N2 +6H20 Mom}? I”)??? 3. What is the mass in g. of a sample of Mg(H003)2.2H20 (formula mass = 182.3 g/mol) that contains 4.68 x 10 24 atoms of hydrogen. 6 géylfi'ffifgfsa": . “Mi '5 9”“ 1 if} t t m '3': A 709 m J.» 2 5,7 3 “M” B 283 1’82?" C“ 472.4 KS“) 2362 g none of these is within 10% of the correct answer Rockley, Fall 2011, Chem.1314 Exam #2 Redo Form B. Page 3 of 8. 4. What is the mass percent of sulfur in sodium sulfite? £9 25.4 / B 31.1 AA 379.; C D E 22.5 - 68.9 5. What is the molarity of sodium ions in a solution made by mixing 3.58 mL of 0.348 M NaCl with 500 mL of 6.21 x 10 '2 M NaZSO4, assuming the volumes are additive (i.e. final solution volume = 503.58 mL) A 0.126M M57 3 xiié, Ea -e B 2.54M i” f (13) 00541 M D 0.378 E 0.042 6. If rust consists of Fe203.4H20 (formula mass = 231.7 g/mol), how many grams of Fe are there in 35.8 kg of rust? A 8630 :35“; 3a a; j 1/ //4w 7 B 17.23 . M C 3.53 7 3 f ' 7 D 309 @ 17,259 Rockley, Fall 2011, Chem.1314 Exam #2 Redo Form B. Page 4 of 8. 7. Bismuth oxide reacts with carbon to from bismuth metal: 283 Bl203 + 30 9 2Bi +300 (we: “g?” If 283 g of Bi203 (formula mass = 486 g/mol) reacts with excess carbon, how many moles of CO form? A 0.61 ‘ B 5.46 C 518 D 209 CE") 1.82 8. When 0.3190 g of an organic compound is burned in a combustion apparatus, 0.898 g of COZ and 0.368 g of H20 is formed. How many atoms are there in the empirical formula? Use these atomic masses: C = 12.011, H = 1.008, O = 16.000 / [Z A 30 »/"‘ .1 “ELM/‘3’} 2 f ‘ iv” awe“? :4; W‘safiw:? ' 1., (Mai? 62 63 . r,//// Ja / D 17 ' -' ' .22..” 4/162"; :35 E 31 Us... a: «Wis? a M ~ , MW “’ - w r IZQ‘S‘E 9. How many moles of ions are present in 321 mL of a stock solution containing 0.22 g of ammonium sulfate (formula mass = 132 g/mol) per liter of the stock solution? ,, Z? 24» 5.04 x 10 '3 N v ) A: 53%? “”"””*'*’;“ A @ 1.6O5X1O'3 imp“ c 5.35x10'4 D 2.14x10'3 E 1.07x10'3 Rockiey, Fall 2011, Chem.1314 Exam #2 Redo Form B. Page 5 of 8. 10. gsow> How many grams of NaH2P04 (FM. = 120.0 g/moi) are needed to react with 43.74 mL of 0.285 M NaOH? The reaction is: Equation is balanced! ,7il 0.0!wa5"? Na 2PO4 + 2NaOH 9 Na3PO4 + 2HOH [Z79 7" 17.1 9 03749 125X1OQg 623x1069 0.748 g 11. What is the sum of the coefficients when the following equation is balanced: 2 0513,0304)2 + ésroz +3’c a P4 + éCaSiO3 + fcoz A 22 if? 25 c 24 /? D 21 /¢ E 20 5E /¢ 12 12. How many oxygen atoms are there in 4.50 g. of aluminum permanganate? A 111x10” do \ B 7.43x1022 fqifl%%£%3w c 5.64 x 10 22 a (63 8.47x1022 E 2.82x1022 at 91? k’ / V_ Aazrkfé is 'm WWW; ’1‘ [/Wéf" Rockley, Fall 2011, Chem.1314 Exam #2 Redo Form B. Page 6 of 8. 13. For the reaction: éi-‘i’fl m1 A928 + 2HCI 9YAgCi + H28 72x? 21%;? What mass in g. of AgCI is formed when 0.25 moles of A928 react with 17.1 g of H01 ? Formula mass of A90] = 143.35 g/mol, HCI = 36.45 g/mol 67.3 0.40 57.34 28.7 none of these is within 10% of the correct answer [1100039 What is the total number of ions in 65 g. of calcium hydroxide? igxmz“ [a my): 5.28x1o23 2.61 X1023 79'" 1.58x1024 63., if i I; 3': am? K 4" M “2”! i m©ow> 3 15. Which of the foilowing has an incorrect oxidation number? A so4 2‘ s = +4 B No3 1' N = —3 C N2 N = O D M1104 1‘ Mn = +7 (E5 CHgOH c = +2 Rockley, Fall 2011, Chem.1314 Exam #2 Redo Form B. Page 7 of 8. 16. What is the number of acetate ions in 52.0 L of 2.3 M aluminum acetate solution? if {It ) fl A 120x102 B 0.119 595 359x102 D 478x102 E none of these answers is within 10% of the correct answer 17. How many total moles of ions are released when the following dissolves in water: 4.03 X10 19 formula units of Sr(N03)2 ? A 134x104nml B 121x1020mm c 667x105mm D 803x1019mo (E5 2mX1otmm aria/52.1.. We 3‘“ t 3 18. If 25.0 mL of AgN03 solution reacts with excess KCl solution to yield 0.842 g. of precipitate, what is the molarity of silver ion in the original solution? F.Wong = 107.9, CI = 35.45 K = 39.1 N = 14.01 0 = 16.00 Hint: write out the balanced equation and determine What the precipitate is. Then it is just a stoichiometry ratio problem. 2379C? Cfi% 5Nx103M AJAmqé 26g wwt Agft A A%% ozssrn ‘ ‘ c 0.166M “2"” D 940M E 0188M Rockley, Fall 2011, Chem.1314 Exam #2 Redo Form B. Page 8 of 8. 19. What is the percent yield of a reaction in which 2000 g. of phosphorus trichloride reacts with excess water to form 128 g of HCl and aqueous phosphorus acid (H3P03)? Equation is balanced. Formula masses (g/mol): PCI3 = 137.3 HCI = 36.45 H3P03 = 81.99 2. [73/ ‘ £81 + 3H20 9 3HCI + H3PO3 (57,3 ($43.39? 26.8 19.6 73.2 A B C (E 80.4 E None of these answers is within 5% of the correct value 20. What is the volume in mL of 2.26 M KOH solution in water that contains 8.42 g. of the solute (formula mass of potassium hydroxide = 56.1 g/mol) £3 66.4 B 29.4 C 126.8 D 3.73 E 7.89 ...
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This note was uploaded on 01/08/2012 for the course CHEM 1314 taught by Professor Gelder during the Fall '07 term at Oklahoma State.

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Exam 2 Redo - ft») Rockley, Fall 2011, Chem.1314 Exam #2...

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