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# Exam 2 - Rockley Fall 2010(311131111314 Exam#2 Page 3 of 7...

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Unformatted text preview: Rockley, Fall 2010, (311131111314 Exam #2. Page 3 of 7. 1. What is the mass in kilograms of 4.6 x 10 2“ formula units of magnesium My {gm} 1 phosphate A: g “M; l k ‘ ‘” ire “if: its 9”“ l! xix { 3 y 2.01 x10-3 " ""“““’““ '“‘“”'.‘3 1.03 262.85 — .. a. 201 v 01337.. '0 i 1.9:) My)”; Him-t )1 0.422 mUOWlW ‘F’ Uni} ; m=~5§ :41)“.ng > “2.5; weeks: gm 4. "is. “ "5" ,~.- r ~. \ x ‘ ‘ 9 CA ' re 3, gtw My 2. Determine the number of oxygen atoms in 5.46 g. of calcium phosphite V“ ml) 'r'u‘m‘“ 7.61 x 10 22 M 1.58 x10'2 ‘ 311.1,”) 6.28 x 10 22 9.49 X 1022 8.37 X 10 22 : WUOUJZD 3. Give the empirical formula of the following compound if a sample contains 40.7 percent C, 5.12 percent H, and 54.2 percent 0 by mass. “a” q A C x : t 1' l ‘ :53»? C12H905 CzHO 5.5123 9 1 ‘42:: ; I 1,: z _, C2H302 ' . C4H302 ti : 371i... l 1 . 2;. ,. a ‘ C41H5054 r 7 ' (Cin:.' 1;)1 "Metal hydrides react with water to form hydrogen gas and the metal hydroxide. For example, F“: 521,515? 1 ‘ i A , 1 v , . \z, ,1 - A s..« my 7, -* ' Y ‘1?” 8er (s) tyZHEUMgKOHh (s) +ZH2 (g) :3) Z- k: 11%;] How many grams of hydrogen will be produced from the reaction of 5.42 g. of \$er and 4.65 g of H20 A4.02 2 0.244 %' “W D 2.60 y k Muwmmmmﬂ W. Rockley, Fall 2010, Chem. 13 14 Exam #2. Page 4 of ’7. E 0.122 l _r ‘ R. (:‘Calculate the volume of 2.050 M oopper(ll) nitrate that must be diluted with r a ~“'ater to prepare 275 ml. of a 2.86 x 10 '2 M nitrate ion solution. a W m =3. lag-3 .__.-. «m— M 2,3; xix" m «.7...me Wan“ Wm. Ce (WW. in. a 0.113%; l 3‘ 84 m: 0‘ R7 5 L “a: 3/?3é-ﬁflix?” M Na; “1-92 rm f; c": . r. >1; 7 7.68 ml “D3 0.9.07.” 197 ml Vz'ﬁ‘ "3‘ 394 ml ’ \/ , - (Democrat) om, .‘ Cu(M‘,E}} . S l i l v = ‘0‘ Detail Q mootmw 3 6'9?) W51“ rm )‘nﬂwnmmn'muwl 6. What mass in g. of calcium phosphate pentahydrate will contain 2.4 x 10 24 atoms of oxygen? C 1-2 H} z— ,9 Cl. 2.09:»: . get a“ a 'V gm 3? ..., , g p l w. Lil-Kl“? '2 '23”! if Ki, 33' h minim x j; g 5 K 1.85 X 10 23 \g-5..l,,..,.,. m 7W; t m} 13 ‘2 L717? 3 122.7 ‘ none of these is within 10% of the correct answer mimow> 7. What mass of ethanol, CszOH, is required to produce 200. mL of a 0.350 M solution? A 6.44 g t . cg it. B 16.1 g = (3,131 m1. :. Cute 1;in . . gums, ~; C 9.20 g D g v ' ,. V i ‘3‘ “L2 (a! 3.22 g ’ ’ “ ’ ‘ What mass ix‘rtelfa‘orms when 185.5 mL of 0.533 M NaOH is added to "‘“627 mL of a solution that contains 15.8 g of aluminum sulfate per liter? . straw 0.32% >= if"; j g 2 57 g rum-t; r N155?" F “*9 5M. ; “Saul iv AM. 4 1 ' . J . H W I; yin. : r 32‘?“ p , glen |x~.{ 1x 4‘ 32:27.); AW- 21 ,3 9’ Nat“; h? 1 g R: (t: ‘3 \$7€vtzmi¢ .; 9‘01 “t B C 2269 L e ".v‘llﬁlg‘ii'ﬁfm ‘ D 4.529 “#7” H . = am: “,1 . 153‘. Lug/hqu 9. 0.8339 = a-alﬁbi W E tits» 6", Itv,26.2ﬁ5mrnl_ of a standard 0.1850 M NaOH solution is required to neutralize 25.00 mL of H2804, what is the molarity of the acid solution? I {I ‘ Hint: write down the batanced equation ﬁrst. rtmm : D"3‘~é="“ SAW-v- 0.5a? AXKQRQKKHg-‘wtg ""3 N“2.>O‘t t ZHGH: ‘ raver-5;»th Matt 3» E 0.09? M V B 0.1mm . h YE C 0.416 M . If.” ' » g "f? "t m. g) M “1975.7 Ll Rockley, Fall 2010, Chem 1314 Exam #2. Page 5 of 7. D 0.208 M E 0.196 M i A mixture of bases can sometimes be the active ingredient in antacid tablets. It 04826 g of a tablet containing Al(OH)3 as the only base is neutralized with 17.30, mL of 1.000 MHNGa, what is the mass % of Al“)ng in the tablet? The M M L a t 7, formula mass of Al(OH)3 is 78.04 glmol. "('“WJVE it (w: Xia‘Xd IUEI: is} I 7“; p ’Z‘VUL‘); (AWE) A O Cy NO}. "5 It) i ' 632-0 B 35 8 O; 701,: *1 ft: kw‘ﬁ, a "M . o “ C 45.0 °/ 1‘ . d,» , , i ,, D 31 1 °/: "- WW 1 i» i: = geek-:15 V, 93.3 % O M 0 Milk :9 1:211” ij “j l “ " "I l = ‘1 n l 3 o. rm 11. One of the first steps in the enrichment of uranium for use in nuclear power plants involves a displacement reaction between U02 and aqueous HF: 73;; _ i ‘ Y wviv’i" U02(s) +“HF(aq) -» UF4 (s) 411120 (I) 1 (‘3: f4 “7&5 How many liters of 2.40 iii! HF solution will react with 2.15 kg of U02? The formula mass of U02 = 270 glmol ' “’34 W)Z A 4-00 it x i B 537 r '3 J? t} \i all 3‘. D 3185 l " 3 I . 9M ‘2; H; E 0.821 l; i L ﬁt @ A person’s blood alcohol (CszoH) level can be determined by titrating a mple of blood plasma with a potassium dichromate solution. The balanced equation is: x l i) am gm ml 16H+ (aq) + 20r2072- + CzH50H(aq) —+ 4Cr3+(aq) + 2002(9) + 11 H200) in «x 4;. "a . 112 '9 leg; lf§5.-.4§wm,LQLQ.,05~9_61 M CrzOTZ‘ is required to titrate gm of plasma, what is w r J ,, the mass percent of alcohol in the blood? Hint: find the mass of ethanol reacted first, then the mass percent in the blood The formula mass of ethanol is 46.07 g/ mol. ul;:\ L4. H M; ﬂ agw f w A 0.00211 \$27 If; l B 1.057x10'1 0.221 ml k: D 1.10 , 1 0.11 Rockiey, Fall 2010, Chem. 1314 Exam #2. Page 6 of 7. E 4.86 {‘1 CK ’1. v L 13. Calculate the mass fraction of Cl in calcium chlorite FM Q 57 LE _ m 0.248 .3 k C l. 1 m A. g) 0.387 ‘ 0.405 l 71 Die 0.33 0.496 E n 4‘ “' k,“ if“ r y " f A. E 2‘1) .1 z ’3 g? LL73 14. Which of the following will produce no net reaction PeriodicAcid +sociium hydroxide I, V y I H ﬁg mercurous nitrate and potassium sulfide “3‘: “M " ” "'3 t 3‘? __ sodium bicarbonate and potassium chloride Na H11"? 2 + ‘4 (“E "‘5 N“ C' 4 Wm lithium carbonate and hydrocmoric acid L.” t 2 at; “2,; {iii} = . (4;, i 1cm silver nitrate and caicium chloride A 03> 312337;. it Ext My g; ;, ‘ Aﬁ‘id J: ’ 5. When 0.1.335 g of menthol was combusted, It produced 0449 g of C02 a 0.134 g of H20. What is the empirical formuia of menthol? ‘ . . i1 A CSH1OO ﬁg k a'gim 3' s "9"" '1 “P B C6H120 ‘ a. “a .1 , V,“ C Yr ‘. ‘ a 5‘3‘ 3) h i 1 WA 6 A 3‘3 K ' v N ﬁg 4 £1.» "i h k f 3 j J giaEM‘ } E C4H6O a : '3. 2 ~34 v i, . z. ﬂ 3 4 exam: '3 a) H" “K” O 16. When 56.6 g of calcium and 30.5 g of nitrogen gas undergo a reaction that has a 93.0% yield, what mass in g. of calcium nitride forms? Sc.ch 30.53 ’ 1 U.) 53 129.7 2C4 N} "We Ci. “:3 M. t i , {a 9,: g 64.9 ‘Zi‘é/ V {7‘33 Fig.3, ! 1514M. [ C 16.1 “3'17 F, > V! 5/ V ‘ D 161.4 ~ “ " 3 Sat. m, i ‘i ".6; 5 ‘. E I 8 M..._...»...,....., ... ._.-..,,. g k. {i ~ €43 a ‘3 :5? }< ‘57.; .1 V e": 3 {I} t i z. éqaﬂi a . .. ‘:_,,V..~,,_,E 17. What is the voiume in milliliters of 6.44 x 10 '2 M ATP (adenosine triphosphate) that contains 1.68 mmoi of ATP? Leg MM X 1.12%. m; J 1&103,i..«._,;:lm\ new“ new; V M n i ' W . .. 3" W. a v= ;; - ...,-.-:.:.‘. .1). *- w éﬂiw! :13 ~37 AA Rockiey, Fall 2010, Chem.13l4 Exam #2. Page 7 of 7. A 3.83 B 38.3 26.1 D 47 E none of these answers is within 18% of the correct answer QT ' AM"; 18. Concentrated sulfuric acid at 18.3 M has a density of 1.84 g/m L. What is the mass % of sulfuric acid in the solution? t u M 32.9 Hz 9L 1 I 54 a. l we 2_5 a? “it,” t 1‘ ‘1 l L K xv T7: ‘ VA?” A ’ ; l y l (ICMHB . ,, 18.3 we; - t ‘ V ‘ ‘3 WUOUJ> fl!" '3' ’3 AA fl my; ",3" '1 ‘7 t?“ 5‘3 .. 1A 1 M W» 9i} “mg f t, El (7:) 5 v\-‘ > ; [mgr £53. “ r» x ‘" Iii." 19 How many moiéé'gf ions (:otsail kinds) are presentl:ié_g80 mL of 0.64 M lithium sulfate? ' t t ,ﬂ 2a 1,25x10'2 it} 2.3 / I 1.88X10'2 1.92X10'3 1‘1wa; 1.92 6.27X10‘3 V‘ *7 apzsizx-sziL V 2:» X 3 3 3‘33 M?“ “I {4"“3 moom> ll a l 5 ﬂip“; MW. W l ‘ i we 20 If you burn ethanol (C2H50H) in oxygen, what is the sum of the coefficients in the balanced equation (presuming you form carbon dioxide and water only)? amt liw +33%. M RC 33H": 0 “100th ...
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Exam 2 - Rockley Fall 2010(311131111314 Exam#2 Page 3 of 7...

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