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Unformatted text preview: __ KEY— Chemistry 111
Homework #1
Due: September 07, 2005 (Wednesday) 10:15 am. on Blackboard Problems 1—10. Some basic mathematics. If you have trouble with these, come see me, an 81, or
a math tutor ASAP. 1. Solve the following expression algebraically for y... Type your numerical answer in
Blackboard to three decimal places. 600
2+}!2
6&0: (2%yZ)/oo ; zoo +/:oy2 500  .200 =. 4‘00: /00
2 col 2. Solve the following expression algebraically for x... Type your numerical answer in
Blackboard to four decimal places. =100 6x3—xl2=72
éxe/z :. Z/ex
~/2. — 2/0X
X’ _/2 ‘:\"[email protected]$7/=X
2/0 3. Prime numbers are integers divisible only by themselves and 1. What percentage of the
numbers between 1 and 12 (including 1 and 12) are prime numbers? a) 25.0 % .417 % c) 5.06 % d) 50.0% e) 33.3% r) 10.0% /@@¢/@[email protected] 9 /o @x; Chemistry 1 l l 2 Homework #1 / Fall 2004 4. Given that PV = nRT, what is the mathematical expression for T? PV
PV—nR b nR/PV c —
a) ) ) nRT
tilrva e)PVM{
PV
Pv; n I? r —> T: A K
5. Solve the following expression algebraically for x. ..
4 = 3_X_ E
2 x
a) —1.79 b) 3.59 c 0.254
d) 4.46 e) —3.59 0th a and d.
3x 1 — 2 L/
' 9.x
8 X : 3 ’< 2'” 9—‘7’
3x ;— 3 x — .2 Y :
———I 6. You are told that the symbol prepresents an operator that gives you an explicit mathematical instruction. In this case the instruction is: “Take the logarithm base 10 of whatever and then
change the sign of the answer”. In other words... ﬁ=—bg Now let us deﬁne a quantity H = [H307 as the number 6.27 x 101 1. Based on the deﬁnition
above, what would be the value for the pH? Type your numerical answer in Blackboard to three decimal places. ﬂH: z05(é.,a7zx/0’”) : Mata Chemistry 111 3 Homework #l IFa112004 7. Let’s try the same thing backwards... If you are 101d that the 13H is 1.25'what is the numerical value for H = [1130+]? Type your numerical answer in Blackboard to three
decimal places. " 'A/ —/..25' 8. Is the following relationship tru or false? log(2A / B): 2logA — logB ﬂawezeaﬁwwﬁsg 9. A = A0 exp {—kT} is equal to 1n; = —kT True 0 false? 0 2”
4: Age /
:1 627
A0 ” :4
Ag: 'ér 10. The natural log (In) of a number can be negativ @ false? fov aka/W40" 6m[0.§):0,673 l 1. A sample of potassium chloride from Chile contains the same percent by mass of potassium
as one from Poland. sz of deﬁnite composition. b) Law of conservation of mass. c Law of multiple proportions. d) Law of mass action.
e) Law of conservation of energy. a“ _ Chemistry 11 1 4 Homework #1 / Fall 2004 12. A marble that rolls down the aisle in Strosacker Hall loses potential energy and gains kinetic
energy, but the sum of these two values remains the same (assume no friction). a) Law of deﬁnite composition. b) Law of conservation of mass.
c) Law of multiple proportions. d) Law of mass action. ‘W of conservation of energy. 13. H20 liquid has the same mass % H as does H20 vapor. a .w of deﬁnite composition. b) Law of conservation of mass.
c) Law of multiple proportions. d) Law of mass action.
e) Law of conservation of energy. 14. Arsenic and oxygen form one compound that is 65.2 mass percent arsenic and another that is
75.8 mass percent arsenic. a Law of deﬁnite composition. b) Law of conservatiOn of mass. w of multiple proportions. d) Law of mass action.
Law of conservation of energy. 15. A Toyota Prius gets about 50 mpg (miles per gallon) in the summer. How many kilometers
per liter does it get? Enter your answer to 2 signiﬁcant ﬁgures. mzi /léO .
50 x ﬂ X’ ?’é/’I
aaﬂ ‘3785V/L. ~/ ﬁm = 2/.25‘ £72: "‘ol/kmA— 16. How many miles can the Toyota Prius in problem 16 go on 0.05 Cubic meters of gas? Enter
your answer to two signiﬁcant ﬁgures. 0 CPS/n3 ”00"”)3 ‘— Q‘ﬂ“ 50m"
' x T >< ”T x *
”7 /090um 3.??5V/L ?*£' :éé@.7mrltiééomzl Chemistry 1)] 5 Homework #1 lFall 2004 17. It’s 130 miles from Cleveland to Columbus. If gas costs $5.00 per gallon, how much does it
cost to drive the Toyota Prius in #16 to Columbus? Enter your answer to two decimal places
without units or symbols (e.g. $3.52 —> 3.52). 4'
{BOm‘xic’i—li—« $030 3¥3.00 18. Suppose the old dorm rooms were 9.0 ft wide by 12 it long by 8.0 it high. Now suppose that
the new dorms have rooms that are 33% wider and 25% longer, and they have air
conditioning that exchanges 0.8 x 103 L/min. How long would it take the air conditioner to
exchange the air in your room once? Type your numerical answer (to the nearest minute and without units) in Blackboard.
4) :: L  w H
/ . . . . ‘ : 5 . ' 81:0
gJﬁé (LLOft Lac)(%0f£ L333C f4)
=4440ﬂe3 3
. 3 (2.54] . .
. L36 /‘J W0ﬁé 3X (ll/n) x 3am) L W“
m .) z. a) We» 0 8v: =5a92mm #5/ma 2 19. A clearly crazy chemistry student ﬁlls up an 11 inch diameter soccer ball with mercury. The
soccer ball weighs 1/2 lb. when it’s ﬁlled with air, normally. How much does the ball weigh in
lbs when he has ﬁlled it with Hg? Type in your answer to 3 signiﬁcant 5 v=§nr3= ”(ﬁt3113(3)(/z/nx’f*°“)3gu—I/Hw/04m m3 PKAIBZ)’ ‘ /3. 56‘s 5 94 3 He
/,/¥)_y/0 m./5.$¢/é X % r‘”
7’3 700792? 0.4$~3?2:7fj : 34/0,??5 {9% g MOM/‘7 Noticimgr’cf runs;
1‘ 0.5— /6s W 6‘ a" Chemistry [11 6 Homework #1 / Fall 2004 20. Diamonds are a girl’s best friend, supposedly. The density of diamond is 3.5] gcm".
Graphite is a form of carbon commonly found in pencils. Its density is 2.23 g'cm". Which
one would make a larger stone for a ring, a l karat diamond or a 1 karat chunk of graphite? .nphite. b) They would be the same. c) Yeah, but diamonds are sparklyl. d) Diamond. e) Need more information. 21. Dissolving sugar in water is a chemical change. True 22. How many of the following numbers are exact numbers? Type your numerical answer in
Blackboard. Dr. s. is 64 inches tall. <— QFWI'MLA m have2 children. e m MNr'Mmt.’ 014.9 M
010 We There are 3.1 miles in a 5K race. <.__ wfmfﬁVk/W
X 33.28% ofa particular compound is Si‘.Z @here are 5,000 meters in 5 kilometers. 4— 1.»: ad W— . 23. After a particular Case home women’s basketball game, the attendance was reported in the
Plain Dealer to be 500. If you assume that this number contains only two signiﬁcant ﬁgures,
what is the maximum number of people that could have been present at the game? Type your
numerical answer in Blackboard. 5—227 Chemistry 1 l l 7 Homework #1 / Fall 2004 24. How many of the following numbers have three (3) signiﬁcant ﬁgures? Type your numerical answer in Blackboard. 12.01, 6.02 x1073, ”@
\
El 25. How many signiﬁcant ﬁgures should be in your answer to the following operation? Type your numerical answer in Blackboard. 12.7g l2? l.212g—6.0g . g“,
a 26. How many signiﬁcant ﬁgures should be in your answer to the following operation? Type
your numerical answer in Blackboard. 6.626 x 10{Jsx29980 x 108 m/s r” 5.2 9109 m E 27. More, more... 0k, one more... Solve the parenthesis FIRST. 22.45x(16.83—5.4) _ anew/{x (03“)
0.00200 ’ El 0 . 00.2420 Chemistry 1 l l 8 Homework #1 / Fall 2004 28. How many protons are there in one ion of 23Al“‘3 ? Write a numerical answer on Blackboard. /«3 aim/'6 I’M/MA“ /3 = H/DVD’LUMé 29. How many electrons are there in one ion of 28Al+3 ? Write a numerical answer on blackboard.
/3  3 z /O
areamm {:5 QWW"W* 30. A certain singular ion is observed to have 18 electrons, 20 protons and 22 neutrons. Identify
the element and the charge on the i0n. Type the symbol of the element and the charge in Blackboard, separated by a comma and a single Space. For example, if your answer were
Manganese +3, you would type... Mn, +3. 070/;4/49415 35> go.
020~/8 dam 2? / 64,1;2 31. Do the following two substances have the same number protons, neutrons, or electrons?
Type your answer in Blackboard. 60Fe and 6ONi+2. 11/90/9145 $1 Mao/41,414.! #5]an
é0F6 029 3’71 ’ 026
EON/27‘ .2 3’ 3 a. .2 e la/ZLW f Chemistry 1 l l 9 Homework #1 / Fall 2004
32. Let’s look at a situation in which we must keep track of the amounts of materials before and
after a chemical transformation. The concept behind this bookkeeping is the law of
conservation of mass. When—1'5 0g of solid marble chips (CaCO3) are treated with 2500 mL
of an HCl solution (density = 1.3579 g/mL), the marble dissolves, forming a new solution
and releasing C02 gas. The resulting solution weighs 381.5 g. How many liters of CO2 gas
are released? The density of CO2 gas is 1.800 g/L. a) 31.4L @ I13 L c 16.0L
d) 5'73 L e) 21"! L @one ofthese. ﬂtacku’tfs p’DMé/I _
7—5103 + asap/magi.) 33/,5 saw/em 4
2774 O) 34“
: LII/"7’. 53 4, — 3?.5 233.0 COL ASK ‘ :‘fﬁéﬂELi
[71/ 53 /3 g a [.9003 33. Diamond, an elemental form of carbon, is the hardest material known to man. H0w many
carbon atoms are there in 13.6 g of diamond? .82 x 1023 C atoms. b) 4.43 x 1022 C atoms. c) 13.6 x 1023 C atoms. d) 6.022 x 1023 C atoms. e) 13.6 C atoms. 0 None of these. . C WW8! C‘ éOﬁlx/Oﬁw 23
/3 éj X /§.0//ch XM C 7 6,92x/O CCLﬂQM 34. How many grams of oxygen are there in 17.0 g of ozone gas (03)? a) 34.0 g .10 g c) 5.67 g d) 51.0g 'e) 0.354g f) None ofthese. IgO 03 '
j L/9l030 WMWJ/ Chemistry 111 10 Homework #I /Fall 2004 35. How many moles of oxygen atoms are present in 17.0 g of ozone gas (03)? .06 mol 0. b) 0.354 mol 0. c) 0.354 x 1023 mol 0. d) 17.0 molO. e) 5.66x1023m010. t) Noneofthese.
”,8 0
/’7.C930§)< W 3 X 3 MM 0 _
'— /. 0 Q WAC O ‘97'9?7j M 03 36. How many carbon atoms are there in a 12.0 g sample of C6H1206 (glucose)? MW = 13016 a) 6.022x1023Catoms b) 4.01x1022Camms c 1.706x1024Catorns
d) 1.0x1023Catoms e) 2.00x1022Catoms one of these.
2:
”7.03 65/730” M €910,206 6M 0. Aozzx/o 4A...“
__./ K XWJ
Mex/e3 M Ob 204 M a ; 2.40/1 x/JN' C aka—mm 37. To protect iron from corrosion, iron sheets are often coated with zinc metal (Zn). The
coating requires 2.0 x 1015 atoms/cm? How many grams of zinc are required to coat a 100
cm x 100 cm sheet? a) 0.0022g b) 3.3x10‘9g c 3.3x10‘5g
d) 1.3x102‘g e) 2.2g None ofthese.
was .. /90Cm x/aocm K 2513“ = ROCK/09’6”}:
R.00x(0vcmay mama’ihvuxx ”'5 a" x ‘55“)?
T 2.02.: (“I—0:361:87: male 2%
: ‘7’ 3 X /033 38. One mole of /m§¢(C6H1206) contains a total of 3.2 x 1024 C atoms. True 0
3
6. o 1 2 x lo ”414 /W/» 62 HMO. .. _’:E:334‘, ff . e = 3,51 wow
‘ ' I'm9C?!
CF: ”(105 /nu~6e C aw
39. The formula N202 is an example of an empirical formula. True 0 N10; (an. a Mducfai 1L3 N0
t ”Do/(Mam [@7ka fwmfﬂ AME, Chemistry 11] 11 Homework #1 /Fall 2004 40. When a solution is diluted with water, the ratio of th to initial volumes of solution is equal to the ratio of ﬁnal to initial molarities. True M/Vl"M2VL‘>. ——=——
V: M a...
41. One of the elements that is an integral part of the precious stone emerald is Al. What is the
mass percent Al in emerald, Be3AIZSi6013 ? . 17.2% b) 5.00% c) 13.8%
'9100% c) 6.89% 1) None ofthese.
mm’clr hulls: :6539‘0/23) 4 (1x26.991) +(6 3" 29.07531‘69" {5.99% ‘: 55}.L/9? S/mcf/ [ x26.?3 3
4440.473M 1 Wx/OO : /0.0[7‘ 7° .___________,_._.~_ 42. A sample of pure calcium metal (Ca) weighing 1.35 g was converted to 1.88 g of pure CaO.
If the atomic weight of oxygen is taken to be 16.0, what is the atomic weight of Ca? Enter
your answer to 3 significant ﬁgures. ('4 ”—9? Ca. :9
"35:? /..«?}’j [533 Caro—(.35 C‘a..= toys330
.“  0,033/2s‘wfc9 => 0,033/15’mo—1 Ca.
/ . £35 (A i .
flakMax €018 fl/Wel 43. The molecular formula of caffeine is C3H10N402. What is its empirical formula? Type the
formula in Blackboard. For example, if your answer were Na2C03, you would type
Na2CO3. 2 I CquA/o Chemistry 1 l l 12 Homework #1 / Fall 2004 44. The compound H3XO4 consists of 3.086% H by mass and 65.31% 0 by mass. What is the
identity of element X? Type your answer in Blackboard. Kﬁ: Lapyj x smlc ll mic H3X0¢ up 1003 H3X09¢ 3. 0565 H x ”ta/c H Mo/c HaXOU mph X / ozofmés X /00— (3.086+6s’.3/): 3/.éoj X ,‘n /003 0/1 f—GXOV 45. One mole of oxygen gas has as many atoms as one mole of neon gas. True / had/<2 02 ha; 2 M; o’ A/‘am: / Marﬁe Ne A45 //Ma/‘c 3/ 427%ij 46. A compound has the empirical formula CH20. If the molecular formula of this compound
contains 72.1 g of carbon, what is the molecular weight of this compound? Type your
numerical answer in Blackboard to no decimal places. For example, if it were 245.7, you wouldtype246.
72 / C fﬁffsf __. g," ——> moémfw 1, (35 Ha 05
'3 x 0101/5 W544“ mo/cuelasr= (6X {3‘0//)4' ([2 X /r009) 4 (é x (§'$9,) Mesh}
: [26.21 ._>, l/?0 i 47. Cinnamic alcohol is used for perfume in soaps and cosmetics. It's molecular formula is CngoO. Type its empirical formula into Blackboard. For example, if your answer were
Na2C03, you would type Na2CO3. 32% 0 chumL I‘d—euca— “’44 Silt65%;:
1’13 anvartj SI‘M/J/er Chemistry ll] 13 Homework #1 [Fall 2004 48. The smell of garlic is caused by a molecule called allicin. An analysis of allicin shows that it
is 44.4% carbon, 6.21% hydrogen, 39.5% sulfur, and 9.86% oxygen, by mass. The molecular
weight of allicin is about 162 g. Type the molecular formula of allicin into Blackboard. For
example, if your answer were Na2C03, you would type Na2CO3. ”Mama.3. 3.577mac ——> éwwCAC [moi/3' 7'
£.2/j#xm"¢‘___.ﬂ .E g,/¢,/Mé.ﬁ’ F9 /0 ”rm/4
1.61:3?) 39:5 3 male 3 = ' 7 a/f S #63
Q X 32.06573 / ﬂit—m ——’> .L mu
9125 (D K mo/C 0 _ 0‘5/6M0 “—'—"—> / mo/eO 3 IS‘ 5975 pa'w‘ale. 012 m m M has _
49. A certain amount of an unknown hydrocarbon (a compound that contains only C and H) 15 mixed with some Oxygen gas (02). A 50.0 g sample of this mixture is burned and it is found
that 16.7 g of C02 are formed, together with 7.02 g of water. Based on this information only,
determine the percent hydrocarbon in the orifinal mixture. Enter your answer t one decimal place. a/ /—/ wmds 0E M we. ¢ New”: WW all C wgrlﬂii 0f f" 6&2. Mr ... 1' «4 W» =14; H» 92 0 31'3”???
Mir/{cue ”445$ 2 /62.3j,)m Vﬂ’ut +29
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5.514?!» 444.4 (bf11W MIMI?” mt’h’wl W55 4; 4,5523“ 0. Mrs H AVWCW’“
3' 5543} Cxﬂy
gavaijH/x mo slam? °/{ l
l Chemistry 111 14 Homework #1 /Fall 2004 50. A 3.491 g sample of MCI3 is dissolved in water, and an excess of silver nitrate is added to precipitate all of the chloride as AgCl (MW = 143.4). The mass of the AgCl formed is found
to be 7.170 g. Identify the element M. Type the symbol in Blackboard. Mag, +3.4.5A/a3 4314ch + Mal/$333 I 5‘ Maﬁa: you dam 'IMa/ 1‘71: who/e ‘bﬂmd
7,1170 AaCB M £16! mole Mar, 5 oohhp  as e 5 J X {43.45 X5 ADC/l. Mater/I’V— bills : L667 x/a'lm/c M443 mo/ar maSSo/M i/
3.1{9/3 Mae. ___ _(/_
/,££.7x/9'LM Zaﬁgjﬂawﬂ  X 4 5135.45)
”‘9’” M4“ "'1!1 X —_ /03./ j/MWK —? Kl.
M665 51. Isopentyl acetate, C7H1402, has the distinctive smell and taste of bananas and is a liquid at
room temperature. Consider the combustion of isopentyl acetate. What is the coefﬁcient of
the C02 in the balanced reaction, assuming that there are no fractional coefﬁcients? Write
the number in blackboa/rg. .— __,.3, " (to —t~ #114 .9 z 6,. My 02 + 1’9 ﬂ; ——? [9(3ch + /l—f H20 —_
'_— 52. How many grams of water will be formed in the complete combustion of 30.3 g of isopentyl
acetate (IPA), MW = 130.19? Enter your answer in Blackboard to 3 signiﬁcant ﬁgures. 30,3 IPAXM/Pﬂ NMHZQ H.023 : q,
j /_30./9j nga/xm K MED 2 Béj :2?14j Chemistry I l l 15 Homework #1 / Fall 2004 53. Potassium cyanide (KCN) reacts with hydrochloric acid (HCl) to make the poisonous gas
hydrogen cyanide (HCN) and KCl. If a sample of 0.500 g of KCN is treated with excess
HCl, how many yams of HCN are formed? Enter your answer in Blackboard to 3 signiﬁcant
ﬁgures. KCN + Mae *9 HCA/ + KC?— 54. In the reaction of KCN and HCl above, how many gams of HCl are required to react the
0.500 g of KCN completely? Enter your answer in Blackboard to 3 signiﬁcant ﬁgures. aswj KC/Vx""“*"____'___a_’<5’"Y ““3 ”a XML = @280 I
6.9/09 m6 KCN MHL‘E j
HOE. 55. Laughing gas (N20) can be produced by the thermal decomposition of ammOnium nitrate
(NH4N03). The other product is water. How many grams of N20 are formed if 1.234 g of
ammonium nitrate is used in the reaction? Enter your answer in Blackboard to 4 signiﬁcant ﬁgures.
NL/L, N03 a N20 +2142 0 mm“: lbw/4r 90.09/334’4 44.0/33/M {j massej Last/j NHII/UOB x MNA’g/Wg ”we. {40 X Veto/33 \I Kitty/33 ’W‘eN/‘lyA/gg M N71) Chemistry 111 16 Homework #1 /Fall 2004 56. How many grams of Butane gas (C4Hlo MW = 58.1) are needed to burn completely with
100.0 g of 02 gas? Enter your answer in Blackboard to 3 signiﬁcant ﬁgures. 64H“, #90; H700; +5u10 :2.
/a¢9,03 Q2 X "nu18¢ 69:. 2 made.— CVI‘I'O 55’, {'5
ac ————————— x €4
32.03 /3 M 633. M4" (@4449 2’27'93 Beefamt __.__—— 57. What is the minimum mass of 02 gas needed for the complete combustion of 50.0 g of
butanol (C4H90H, MW = 74.12)? Enter your answer in Blackboard to 3 signiﬁcant ﬁgures. cy/Jgoy +é02 >4/c02 +5H£0 50OjCyH7OK/x lbw—p C3! [tr/2019’>< 6M 01 X 32. 0:
?l/,/,zj Maﬁa/4 Jew—‘6 0‘1 4/30, 3 O; 58. Nitric oxide (NO) reacts with oxygen gas (02) to form nitrogen dioxide (N02). In one
experiment, 15.0 g of NO is reacted with 20.2 g of 02. Which species is the limiting reagent?
Type the molecular formula into Blackboard. For example, if your answer were Na2C03, you
would type Na2CO3. H asoomleO/Z ‘ 0.25’ No ﬂ 0.63/W601// :5 0.63/ @3— Chemistry I l 1 17 Homework #1 / Fall 2004 59. Consider the combustion of glucose (C6H1206 MW=180.1) to form carbon dioxide (C02
MW=44.01) and water (1120 MW=18.02): C5H206 + 602 '9 6C02 +6H20 (Note: this is net reaction that occurs when we metabolize the glucose that we eat.) If 500.0
g of glucose was burned with 5000 g of oxygen, how many grams of C02 would be produced? Enter your answer into Blackboard to 4 signiﬁcant ﬁgures.
/57r5# / head :49 ﬁnd m 1’.er / :17 M‘ng/£ ' 500'03 546306 x mic = 2.?17‘é M (gs/4.10; /.?0./_j
500.03 0a x m :/Cég5’m.€e 01/6 :7. 2.409! 0;. 9‘?
32495 LHQ.
/§435W0;x_éﬁi92=~x M = gyagzj 50.2.,
6W0; ”Va3&9}, 60. In the problem above, how many grams of the excess reagent will be left over? Enter your
answer into Blackboard to 4 signiﬁcant ﬁgures. £45162; Manx/M Q H'loé ; 2. 505/ wee2 Qﬁgo‘ area!
6 M02 2376 «2.40% = a /72W6 66H 06 Afr 015mm ﬁat/got” /90./g 7“
MQleo‘ 61. The decomposition of the explosive nitroglycerine (C3H5N309 MW=227.1) produces four
products: nitrogen gas (N2 MW=28.02), carbon dioxide (CO; MW=44.01), water (1120
MW=18.02) and oxygen (02 MW=32). How many garﬁs of oxygen can be produced ﬁom
1.000 kg of nitroglycerine? 2 63/1/5N307 —’>3N2_ +6601 +5%..0 + 2:— 0 2— J
nowkﬂ gngoa oak/000g x [pp—en. aging—A330?x 2.1%“ 01 K 3:2. 03 wgeuﬂ M0»
'r—‘(Bsr 235 c3:J New”! I 1.‘. W .m.————"' Chemistry 1 l l 18 Homework #1 / Fall 2004 62. A mixture of methane (CH4 MW=16.04) and ethane (CzHe MW=30.07) of mass 13.43 g is
completely burned in oxygen. If the total mass of C02 and H20 produced is 64.84 g,
calculate the fraction of CH4 in the mixture. Enter your answer in Blackboard to two decimal
places. For example, if your answer is 25%, you should enter 0.25. 629/ +202. “—5“ C02 +ZHLO
6,1};67‘302. _—'?2.CO_L #311’20
CouscNa/vm a maze: %e_//S as [low mud a; we
used and ,1 mass 7,: of 02 2a £9Ur Pm‘Lud
mg‘th We; ﬁﬂe’é/ fa: nmss % 9/ 2:32 2}»; 64:24
Frachavrb 212.4% ﬁt»? PM («:44 Aﬁwﬂi ocuz‘: 2,5“
% CH6; ‘r'f {ILL WHY Wrae, (gar. ﬁat{L 29,1" Pa?) 63. A yield of 4.00 g of KC104 is obtained from the following unbalanced reaction when 5.00 g
of reactant (MW = 122.6) is used. What is the % yield of this reaction? ‘7’ KCio3 +3 KCIO4 + KCl Enter your answer in Blackboard to one decimal place. 6003 KwogxMKQha 3M #540,. x m = 1,2243
52.2217 4MKC205 Meka’ay _.____ 4.00 , Hem/12a)! 64. How many grams of NaCl are required to make 100.0 mL of a 0.2000 M solution of NaCl?
Enter your answer in Blackboard to 4 signiﬁcant 6 gures. /04§7»0r711.x l— 0.2069M/4/ach 53.9'9/53 >2
/000m£— L.— W—Cc [U4 Ct ={W 1’3““ bar/L mass % o : (29,003 a m (“:93 V 4—3— : 32,0 0 m ’1 0;
ﬁ:§2§.tﬁ [426) ka/éﬂx /W€0x Ila03 _3/
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