推 ptt789789:昨天熬夜嗎?10點半不到算爆肝喔?? 11/09 22:32
課程名稱︰普通化學乙
課程性質︰必修
課程教師︰林萬寅 教授
開課學院：工學院
開課系所︰土木工程學系
考試日期（年月日）︰2007/11/09
考試時限（分鐘）：10:20-12:10
考試範圍：Ch1-Ch6
是否需發放獎勵金：是，謝謝
試題 :
General Chemistry November 9,2007
1. Define the following terms
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(a) accuracy and precision
(b) atomic mass unit and atomic mass
(c) theoretical yield and percent yield
(d) state and state function
(e) heat capacity and calorimetry
2. Give the chemical formula for the following compounds.
10%
(a) sodium hydrogen phosphate
(b) dinitrogen trioxide
(c) ammonium chlorite
(d) chromium(II) fluoride
(e) aluminum sulfate
3. An organic compound (called X) contains only C, H, and O. 1.50 g of X was
analysed by elemental analysis as shown in the following figure. After
analysis, the masses of the absorbents Mg(ClO4)2 and HaOH increased by
1.23 g and 3.00 g, respectively. It was found in another experiment that
the vapor density of X at 1.0 atm and 400 K was 2.68 g/L. Answer the
following questions.
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(a) Name the compounds Mg(ClO4)2 and NaOH.
(b) Give the gases that are absorbed by Mg(ClO4)2 and NaOH.
(c) Determine the empirical formula of X.(C=12, O=16, H=1)
(d) Find the molar mass of X.
Assume ideal gas and R=01082 L*atm*mol^(-1)*K^(-1).
(e) Determine the molecular formula of X?
(f) Give the oxidation numbers of Cl in Mg(ClO4)2 and C in X.
┌───────┐ ┌──────┐ ┌────┐
│ 1.50 g sample│→│ Mg(ClO ) │→│ NaOH │→waste
│ +excess O2 │ │ 4 2 │ │ │
└───────┘ └──────┘ └────┘
4. A mangnesium wire (0.24 g) was put in an open beaker (at 1 atm and 25℃)
containing 50.0 mL of 1.0 M HCl. Knowing that the standard enthalpy of
formation for Mg2+(aq) is -476 kJ*mol^(-1), Mg=24,
and R=80314 J*mol^(-1)*K^(-1).
Answer the following questions.
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(a) Write a balanced chemical equation for the reaction occured in the beaker.
(b) Claculate the standard molar enthalpy for the reaction given in (a).
(c) What is the limiting reagent for the reaction in the beaker?
(d) Estimate the enthalpy change for the reaction in the beaker.
(e) Find the volume of the librated H2(g) at 1 atm 25℃.(assume ideal gas)
(f) Calculate the work done by the librated H2(g).(Hint: a constant-P process)
(g) Find the values of q and △U.
5. Two flask connected through a closed value contain H2 and O2 separately as
shown in the following figure. Answer the following questions.
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╭───────╮ ╭──────╮
│ │valve │ │
│ O2(g) │ ╤ │ H2(g) │
│ 2 L, 1 atm └─∣─┘ 1 L, 8 atm │
│ 25℃ ┌─│─┐ 25℃ │
│ │ │ │ 註：這原本是兩個球型的瓶子，
╰───────╯ ╰──────╯ 無法在此表示故以圓角矩形代替
(a) Which flask contains more molecules?
(b) Which molecule has greater density?
(c) Which molecule gas has greater average kinetic energy?
(d) Find the relative root-mean-square speed of H2 to O2.
(e) Find the realtive effusion rate of H2 to O2.
(f) If the valve is opened, what is the final pressure of the system?
(g) Find the mole fraction of H2 after the valve is opened.
(h) Find the partial pressure of H2 after the valve is opened.
(i) Calculate the concentration of H2 in mol*L^(-1) after the valve is opened.
(j) If the flasks are immersed in boiling water at 100℃, find the percentage
increase of the average speed of H2.
考試規則：可代計算機、翻譯機、中英文作答皆可、可提早交卷
註：因為BBS上面只有純文字的關係，化學式無法打得很美，請見諒
* 是【乘號】 ^(-1) 是【放在分母】
化學式上面的數字請自動視為【下標】
如有任何更好的標示方法麻煩寫站內信告知
此時打字者已經爆肝，如有錯字請善心人士以站內信告知，也請多包涵，
感謝您的合作
※ 編輯: catherinekao 來自: 125.232.198.187 (11/09 22:22)