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Unformatted text preview: Exam #1
Chemistry 112 Spring 2010 Name: AW6W€V_WX Last 4 digits of Student ID Number: Show All Work 2 1. (5 points) Arrange the following solutions in order of decreasing osmotic pressure Write
“lowest” underneath the lowest. 3) 4.0Murea “1:1 I M 5 (f
b) 2.5MNaC1 g: ”‘2. M c. 6'
c) 1.5 MBa(NO3)2 “i :1 3 m : ‘r‘f
6’) 3.0Msucrose i CL 3 M 5 } 2. (8 points) A 1.0 M NaOH solution in water has a density of 1.1 g/mL. Express the concentration
of this solution in. molaiity (MW NaOH : 40 gfmol) .5 WM! % mm mm
WM WW
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WK 2' my}? wﬂﬁ
Wag €0lwhw CMMMHLQ lmak’ MW” 4W2
Hwﬁ 40:: we? : W6 9 ma WNW; TAX/gm“ [ﬂown/1) 3. (7 poil‘lts) Kc at 970 K is 2.0 x 10‘4 K for:
N2 (g) + 02 (g) H 2N0 (g)
Calculate Kc at 970 K fOr 4N0(g) «a—b 2N2(g)+202(g) WWV‘M’ . z
kc“]£ﬂ}/Wﬂ% .:: /Kc, VﬁVWVf/C’ dbl/1M4! (ijéﬂl‘C/[W7Zf “’5“ $§VMWE KC, 4. (8 points) List all the intermolecular forces present in a) Methylamine (CHBNHZ) [Q B D D H E b) Carbon dioxide (C02) L D
c) chioromethane (CH3CI) (L D D D d) Nitrogen dioxide (N02) L D D D S. (8 points) A £0 Wt% solution of an enzyme in water has an osmotic pressure of 8.7 torr at 298 K. Calculate the molar mass of this enzyme. Assume that the density of the solution is
LOO g/mL. WZMRT 5?“ YEW/>6 ”71"” ; (gag/say”,
%0 aim/V 0.9m ﬁlm: /l/l (WWW???)
Mr; #55500”? I0 WW7!) ﬁslulgw =1me l QQg» up 500; 692%}{W £002, «ﬁg/ma, JW’QLIV’ ; l
[00:49: 90mm: LLE%~?V W" 1003; Aégm‘ZKW/w M Ala/WV” “7L9“ 6. (8 points) A. scientist. seals 0.5 moles of nitrogen dioxide and 2 moles of dinitrogen tetroxide in a
1 Liter container. Kc is 15 at 40°C for: 2 N02 (g) M N204. (g) Caiculate the reaction quotient, Q, and indicate in which the reaction will proceed. R represents to
the right, L represents to the left, N means no reaction QMMZ’ @171 Z 3
W 1:} Q9 5’) ’7. (1.4 points) 1 mole of NO2 is placed in a 1 Liter flask at 100 °C. At equilibrium the
concentration of O2 is 0.10 M. Calculate KC. 1 Q 0
M2»; Jew. ~6><
1.92.; w x CQJWW 3‘ "<
1,591., 2170,?) @ L
0 Q 9.2, 9 i 8. (14 points) 1.0111016 of PC}3 (g) and '1. .0 mole of C12 (g) are piaced into a 1 liter ﬂask at 500 °C. PGSCgHCMg) W PC15(g) if Kc x 5, What is the equiiibrium concentration. of PC15. Express your answer to 2 decimai places. I f 1 O
C; w>< WK —tx
67, L ”X; («>61 >< 9 9. (14 points) Lanihanum hydroxide, La(()H)3 is dissolved in water. The equilibrium
concentration of La+3 is 8.8 x 10'6 Molar. Calculate Ehe value of Ksp. Iwa(0H)3(s) M La+3 (aq) + 3 OH“(aq)
3
Kéf 3: [M9109 94] AméOH)? ””3 [all ~t' 3QHM
l WM M" W
C «wt 35%; +63% ﬁche/l x W
(:iéﬂfalz gﬁwen Twig; 3y: 5.95%‘15 .::: 25wa 6 M. 6 KW : (gtgﬂaﬂéxa é 4'“ >5 “55)? «I?
——~ 11.5wa W 10 10. (14 points) The Ksp of Calcium Fluoride, C32, is 3.9 X 10'“. Calculate the molar
solubility of (321133 in a 1 molar €330)ng solution. Express the answer to two decimal places. {0; F2”‘3 Gnnﬁfz‘f’ Z33“ C“ ﬁCFath, ”’3’ BC???” +3 1 Pat? H l WﬁlW 3 mam, Zmﬂé‘t” 6% F2“) CalUta”? 2F“ l Golly/l 3 ‘9
C vat. {xi —{;Z,>< ll Extra Credit: (5 points) Explain why 500 g of NaCl added to £0 Liters of water will lower the
freezing point of the resultant solution more than adding 500 g of KCl to 10 Liters of water. WWW male MM %m k% [L7 97‘6”? 25> ﬂmeLW 6a/wfzm
CWW‘thlzaw 23> ﬁmﬂii‘ﬁ’ {1663114 farm 55* Ma’fﬂﬁé/W ...
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