[試題] 101上 佘瑞琳 普通化學甲 期末考
課程名稱︰普通化學甲
課程性質︰必修
課程教師︰佘瑞琳
開課學院：工學院
開課系所︰化工系
考試日期（年月日）︰2013/01/04
考試時限（分鐘）：110 min
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
Atomic mass (in amu) : He = 4.00, N = 14.01, O = 16.00, K = 39.10, C = 12.01,
Cl = 35.45, Ne = 20.2, Na = 22.99, P = 30.98
c = 3.00 * 10^8 m/s; h = 6.626 * 10^-34 J-s; RH = 1.096776 * 10^7m^-1; 1 eV =
1.6 * 10^-19
Gas constant : R = 8.314 J/mol-K = 0.082 L-atm/mol-K; 1 L-atm = 101.3 J
I.Multiple choices question (40%. Each question may have 1 to 4 correct
answer)
1.A glass vessel weights 40.1305 g when clean, dry, and evacuated; it weights
138.2410 g when filled with water at 25°C(density of water = 0.9970 g/mL).
The same glass vessel is filled with an unknown gas at 772 mmHg and 22.4°C.
The gas-filled vessel weights 40.4868 g. What is the molar mass of unknown
gas? (p.208, 6-7 A)
(a)6.55 (b)86.4 (c)8759 (d)can not determine
-> b
2. 2.0 L of O2(g) and 8.0 L of N2(g), each at 0.00°C and 1.00 atm, are mixed
together. The nonreactive gaseous mixture is compressed to occupy 2.0 L at
298 K. What is the pressure exterted by this mixture ? (p.213, 6-11 B)
(a)2.0 atm (b)4.6 atm (c)5.0 atm (d)5.5 atm
-> d
3.A sample of CH4 gas initially at STP is compressed to a smaller volume at
constant temperature. Which of the following will be changed during the
process ?
(a)the number of collisions they make with the container walls per unit time
(b)the pressure of the gas
(c)the average kinetic energy of the molecules
(d)the root-mean-square speed of the molecules
-> ab
4.If 2.2 * 10^-4 mol of N2(g) effuses through a tiny hole in 105 s, then how
much H2(g) would effuse through the same orifice ?
(a)1.6 * 10^-5
(b)5.9 * 10^-4
(c)8.2 * 10^-4
(d)3.1 * 10^-3
-> c
5.Calaulate urms(rms是底標), in meters per second, for Cl2(g) molecules at 30
°C.(6-73)
(a)10.3 (b)32.3 (c)102 (d)326
-> d
6.Which subtances listed in Table 12.5 can exist as liquids at 20°C ?
(a)H2 (b)CH4 (c)HCl (d)SO2
-> cd
7.Which of the following rankings is correct ?
(a)Surface tension : n-C5H12 < (C2H5)2O < CH3(CH2)OH
(b)Viscosity : C3H7OH < HOCH2CH2CH2OH < HOCH2CH(OH)CH2OH
(c)Melting points : NaF < NaCl < NaBr
(d)Density : graphite < diamond
-> abd
8.A 0.72 g sample of polyvinyl cholide(PVC) is dissolved in 250 mL of a
suitable solvent at 25°C. The solution has an osmotic pressure of 1.67 mmHg.
What is the molar mass of the PVC ? (13.59)
(a)32
(b)2.7 * 10^-3
(c)3.2 * 10^4
(d)3.2 * 10^6 (g/mol)
-> c
9.The osmotic pressure of a 0.010 M MgSO4 solution at 25°C is 0.318 atm.
Calculate i, the van't Hoff factor for MgSO4.
(a)1.0 (b)1.3 (c)1.5 (d)2.0
-> b
10. Place the following aqueous solutions in order of increasing
boiling-point elevation (△T).
(a) 0.10 m CO(NH2)2 (urea) < 0.10 m NH4NO3 < 0.10 m CaCl2 < 0.10m CH3COOH
(b) 0.10m CH3COOH < 0.10 m CO(NH2)2 (urea) < 0.10 m NH4NO3 < 0.10 m CaCl2
(c) 0.10 m CO(NH2)2 (urea) < 0.10m CH3COOH < 0.10 m NH4NO3 < 0.10 m CaCl2
(d) 0.10 m CaCl2 < 0.10 m NH4NO3 < 0.10m CH3COOH < 0.10 m CO(NH2)2 (urea)
-> c
11.According to the figure shown here (見課本 p.576, Figure 13.13)
(a)At 1 atm, the boiling point of toluene is about 110 °C
(b)At 1 atm, the boiling point of benzene is about 80 °C
(c)At 1 atm, a benzene-toluene solution with Xbenzene = 0.3 boils around 98°
C
(d)Toluene is of each gas is same
-> abc
13.Which of the following molecules can form hydrogen bonding with water ?
(a)ethanal(CH3CHO) (b)CH3CH2CH2OH (c)CH3COCH3
(d) CH2OH OH
| O |
|/ \|
\___/
| |
OH OH
-> abcd
14.Freeze-dried coffee is prepared by freezing a sample of brewed coffee and
then removing the ice component by vacuum-pumping the sample. What kinds of
phase changes taking place during theses processes ?
(a)condensation (b)deposition (c)melting (d)sublimation
15.The unit cell of a binary compound of copper and oxygen is shown here.
http://0rz.tw/6yXbb
(a)The coordination number of copper atom is 2.
(b)The coordination number of oxygen atom is 2.
(c)There are 2 Cu atoms/unit cell.
(d)The empirical formula of this compound is CuO.
-> a
II.Problems(70%)
1.
(a)Write the van der Waal's equation to predict the behaviors of real gases.
(b)List two reasons why the gases deviate from ideal behavior.
(c)Calculate the pressure exerted by 1.00 mol Cl2(g) confined to a volume of
2.00 L at 273 K.
The value of a = 6.49 L^2-atm/mol^2, and b = 0.0562 L/mol. (8%, p.228, 6-17)
2.
(a)Sketch a phase diagram for hydrazine(N2H2) from the following data :
triple point (2.0°C and 3.4 mmHg), the normal boiling point (113.5°C), the
normal melting point (2°C), and the critical point (380°C and 145 atm). The
density of the liquid is less than that of the solid.
(b)Label significant data points on the diagram.
(c)Indicate the gas, liquid, and solid phases on the diagram.
(d)Could we apply pressure to liquefy the hydrazine at 400°C ? (10%, p.550,
12-50)
3.A handbook lists the normal boiling point of isooctane, a gasoline
component, as 99.2°C and its enthalpy of vaporization (△Hvap) as 35.76
kJ/mol C8H8. Calculate the vapor pressure of isooctane at 25°C. (4%, p.517,
12-5 B)
4.At room temperature, iron crystallizes in a body-cubic (bbc) structure. By
X-ray diffration, the edge of the cubic is found to be 287 pm.
(a)What is the coordination number of the iron atom ?
(b)How many iron atoms are there in a bcc unit cell ?
(c)What is the radius of the iron atom ?
(d)The molar mass of iron is 55.85 g/mol, and the Avogadro's number is 6.02 *
10^23. Calculate the density of iron. (10%, p.536, 12-9, 10)
5.Giving the following data, calculate △Hf° of CaCl2(s). (6%, 544, 12-12B)
Enthalpy of sublimation of Ca(s), +178.2 kJ/mol
First ionization energy of Ca(g), +590 kJ/mol
Second ionization energy of Ca(g), +1145 kJ/mol
Lattice energy of CaCl2(s), -2223 kJ/mol
Enthalpy of dissociation of Cl2(g), 244 kJ/mol
Electron affinity of Cl(g), -349 kJ/mol
6.Vitamin B2, riboflavin, is soluble in water. If 0.833 g of riboflavin
dissolved in 18.1 g H2O, the resulting solution has a freezing point of
-0.227. (Kf of water is 1.86 °C/m)
(a)What is the molality of the solution ?
(b)What is the molar mass of riboflavin ?
(c)What is the molecular formula of riboflavin if combustion analysis shows
it to consist of 54.25% C, 5.36% H, 25.51% O, and 14.89% N ? (6%, p.583,
13-10 B)
7.At 0°C and O2 pressure of 1.00 atm, the aqueous solubility of O2(g) is
48.9 mL O2 per liter. What is the molarity of O2 in a saturated water
solution when the O2 is under its normal partial in air, 0.2095 atm ? (4%,
p.572, 13-5)
8.An ethanol-water solution is prepared by dissolving 10.00 mL of ethanol,
CH3CH3OH (d = 0.789 g/mL), in a sufficient volume of water to produce 100.0
mL of a solution expressed as
(a)mass percent
(b)mass/volume percent
(c)mole fraction
(d)molarity
(e)molarlty (10%, p.560, 13-1)
9.The vapor pressure of the pure hydrocarbons at 25°C are 508 mmHg for
pentane and 149 mmHg for hexane. If a hexane-pentane solution has a 4 : 1
mole ratio of pentane to hexane at 25°C.
(a)What is the mole fraction of pentane in the solution ?
(b)Assuming ideal solution behaviorm, what are the vapor pressure of hexane
and pentane above the solution ?
(c)What is the total pressure ?
(d)What is the mole fraction of pentane of the vapor in equilibrum with
hexane-pentane solution ? (10%, p.574, 13-6 A)
10.Give several topics in general chemistry you've learned from this semester
that is impressive or interested to you. (2%)
PS. 附週期表
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