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Unformatted text preview: Exam #1
Chamistry 112
Spring 2910 Name: A WWW K377 Last 4 digits of Student ID Number: Show All Work 1 L (5 points) Arrange the foliowing soiutioras in order of decreasing osmotic pressure
Write “lowest” underneath the lowest. a) 3.0Murea 3 l M; 3
b) 2.5MNaCl 1e; '2, My: 5”
c) 1..5.1\4133(1\103)2 ‘1 7; 3 m z: 1( 5
‘1) 40M sucrose 1 :2» \ M :r 4i” 2. (8 points) A 11) M NaOH soiution in water has a density of 1.4 g/mL. Express the
concentration of this solution in moiality. (MW NaOH 2: 40 g/mol) 1 MN MW?” Wm Wig mm @ “WV éoW‘tW w ‘ 1 Kg win/W4 Wm; M aolme/w: 3. (7 points) Kc at 970 K is 8.0 X H)"3 K for:
N2 (g) + 02 (g) H 2N0 (g)
Calculate Kc at 970 K for 4N0(g) «mm» 2N3(g)+202(g) [<5 WWW’éf :: VKC {@waV/f Jombiz cwﬂfm'mk w 5mm fa /
KO: “L2: WLW a 3 15a?“
he (fwd?) 4. (8 points)
List all the intermolecular forces present in a) chloromethane (CHECi) A D
b) Nitrogen'dioxide (N02) L D
c) Methyiamine (CHBNHZ) & D LCD (:1) Carbon dioxide (C02) DD
DD DD Hﬁ 5. (8 points) A 10 Wt% solution of an enzyme in water has an osmotic pressure of 5.7 torr at 298 K. Calculate the moiar mass of this enzyme. Assume that the density of the soiution is
1.00 g/mL. 7}”;MRT 9’}???va law w @MWWW.
'91é20é9w’ 0,0935 2: M (eaglbézﬁé?)
M: amxw” M? w%‘% gongwx War gang?
w” '7’ J ﬂ/Wéﬂzy 5 L05? Mwﬂ/ 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 3 at 40°C for: 2 N02 (9 M N204 (g) Calculate 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 QJ/Viﬂérl : 3'1 :3 <3
Wm? QM) 7. (14 points) 1 Mole of NO2 is placed in a 1. Liter ﬂask at 100 °C. At equilibrium the
concentration of 02 is 020 M. Calculate Kc. ENOMg) M 2N0(g)+02(g) '1 1 o 0
C «#21 4:24 TX
6 My: 2%. >4 2021;74:01
e, :«ZCMD 2cm» 0’7“
a 9.5 0.1% 01.
. ’2. ’2.
K ,0sz £051 [0 9 C025
0., 8. (14 points) 1.0 mole of l’Cl3 (g) and 1.0 mole of C12 (g) are placed inio a 1 liter flask at 500 °C. PC13(g)+Clg(g) «mm»? PC15(g) If KC 2 3, what is the equilibrium concentration of P05. Express your answer to 2 decimal places. waéfCiLW; qug‘ 9. (14 points) Lanthanum I’1yc11‘();s;:i4:ie,La(OII)3 is dissolved in waier. The equilibrium
concentration of La+3 is 2.2 x 10’6 Moiar. Caicuiate the vaiue of Ksp. 1_Ja(0H)3 (s) M La"3 (aq) + 3 0H" (in) K5)? if“ “BEWUE 10 10. (14 points) T he Ksp of Calcium Fluoride, C3132, is 5.6 x 10‘13. Calculate the molar
solubility of CaFZin a .1 molar (32130304)2 solution. Express the answer to two decimal places. (0: F2, @ Q¢Z~E Z?“— ll Extra Credit: (5 pOints) Explain why 500 g of NaCl added to 10 Liters of water will lower the
freezing point of the resultant solution more than adding 500 g of KCI {0 10 Livers of water. mam mwlgj Md? Mm KM M é'lﬁﬂ/ \H/ gay/671%” {@ZWQW Wé‘WMNl‘Ww d/L
ﬁVﬁWLé’V fﬂéé%H/LQ
flaw: {7 y/[lgfvtf’fé 12 ...
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 Spring '09
 CHEN

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