課程名稱︰普通化學丙
課程性質︰共同必修
課程教師︰張大釗
開課系所︰獸醫、植微
考試時間︰93/12/17
試題 :
1) Write formulas for the following compounds(10pts)
Ammonium sulfate:
Gallium arsenide:
Silver nitrate:
Chromium carbanate:
Potassium chromate:
2) Name the following compounds(10pts)
Al(OH)3:
NaClO4:
KH2PO4:
Li3N:
N2O4:
Answer 4 out of 5 questions (3~7)
3) 28 mL of 0.25 M nitric acid and 53 mL of 0.32 M potassium hydroxide are
mixed. What is the concentration of H+ or OH- ions in excess after reaction.
(10pts)
4) The standard heat of combustion of C7H16(l) at constant volume and 25°C
is 1148.93 Kcal/mol. Calculate the heat absorbed at constant pressure.
(10pts)
5) Calculate the entropy change when 1 mole of hydrogen at 1 atm is mixed
with 1 mole of nitrogen at 1 atm at 25°C. (10pts)
6) At very low temperature, the heat capacity of a solid is given as Cp=αT^3
, what is the change in enthalpy when it is heated form 0K to a temperature
T.(10pts)
7) Calculate the ratio of distance traveled between NH3 and HCl from two ends
of a tube? Explain why the calculated value is different from the
experimental value? (10pts)
8) 0.350 g of iron ore dissolves in acidic solution, and all iron is reduced
to Fe2+. The solution is titrated by using a 41.56 mL of 1.62*10^2 M
KMnO4 to reach the light purple end point. Balance the equation by half
reation method and calculate the mass percent of iron in the iron ore.
(20pts)
9) One mole of an ideal gas at 25°C expands isothermally and reversibly from
10 atm to 1 atm. Calculate w, q, △E, △H, and △G. (20pts)
10) Assuming that the ammonia synthesis reaction reaches equilibrium at
pressure of N2 =1.47 atm, H2=0.01 atm at 25°C for the following reation
N2(g) + 3 H2(g) → 2 NH3(g) △H°=-92 KJ/mol
a) Calculate the △G°of this reaction at 25°C, b) Under what temperature
condition, the reaction favors the product. c) Calculate the value of K at
900°C.(20pts)
11) Kinetic molecular model was derived to describe the ideal gas law. Derived
the equation (KE)avg=3/2 RT. Assuming particles in constant motion in a
L^3 cubic box and no interaction with each other. Begin with P=F/A. Based
on the model, order the kinetic energy of CH4, N2, Ar, CO2 at room
temperature. Compare their root mean square velocities.(30pts)
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