ࡱ> ac`'` >bjbjLULU ..?.?=HHHH828282822d38888999lcncncncncncnc$sehgjc:99::cHH88;Cd???:xHR88lc?:lc??,Z"d^83 [N824<\$alYd0d\Eh=EhHd^d^Ehx^9"9?:':999ccx?999d::::d4!4!HHHHHH Chemistry 452/456 July 22, 2011 Enter answers in a Blue Book Midterm Examination Key Useful Constants: 1 Newton=1 N= 1 kg m s-2 1 Joule=1J=1 N m=1 kgm2/s2 1 Pascal=1Pa=1N m-2 1atm=101325 Pa 1 bar=105 Pa 1L=0.001m3 Universal Gas Constant R=8.31 J K-1 mol-1=0.0821L atm K-1mol-1 Avagadros Number NA=6.024x1023 mol-1 All answers must be in MKS units (i.e. units of meters, seconds, kilograms, Joules, Pascals etc.) Helpful math relationships: 1)  EMBED Equation.DSMT4  a is a constant, n is a positive or negative number 2)  EMBED Equation.DSMT4  where c is a constant and  EMBED Equation.DSMT4  3)  EMBED Equation.DSMT4  where c is a constant 4)  EMBED Equation.DSMT4  Part 1 (18 points) Answer THREE out of the following SIX questions. Limit definitions to less than 200 words. Use equations where helpful or required, but detailed calculations are not necessary. Question 1.1. Define Eulers Criterion for Exactness. Explain how this rule is relevant to the field of thermodynamics. A differential,  EMBED Equation.DSMT4  is exact if there exist a function Z(x,y) such that  EMBED Equation.DSMT4 . The criterion for exactness is therefore  EMBED Equation.DSMT4 . The path integrals of exact differentials are dependent only on the initial and final states of the path, not on the details of the path itself. Differentials of state functions are exact so when integrated over specific paths, the state function change is dependent only on the definitions of the initial and final states. (74 words) Question 1.2. The entropy has been defined as times arrow. Explain this definition using thermodynamic reasoning. Utilize in your argument the statistical interpretation of entropy. The equations of mechanics (F=Ma) are time reversible. This means they are as valid going forward in time as going backwards. In contrast, the entropy of an isolated system increases from initial to final state, or remains the same. The final state is understood to be reach later in time, so moving toward the final state is marked by increased entropy. The reversal of mechanics in an isolated system , which in turn would decrease the entropy is not impossible, but is nevertheless a highly improbable event. (87 words) Question 1.3 Explain the Carnot engines relevance to the efficiency of heat engines. Explain also the relationship between entropy and the efficiency of a heat engine. Use a drawing of the engine if you think it helps to explain its function. The Carnot engine is an idealized heat engine that operates reversibly. It consists of four reversible steps: isothermal expansion, followed by an adiabatic expansion, then an isothermal contraction in volume and back to the initial state via an adiabatic contraction. The Carnot engine yields the efficiency  EMBED Equation.DSMT4  of a heat engine operating reversibly:  EMBED Equation.DSMT4 , where qH is the heat extracted from the high temperature reservoir (i.e. TH), TL is the temperature of the low temperature reservoir, and wnet is the net work done by the engine. Because the engine is cyclic the net entropy is zero such that:  EMBED Equation.DSMT4  so that  EMBED Equation.DSMT4  Question 1.4 Explain the concept of reversibility as it applies to thermodynamic pathways. A system is displaced from its initial state by application of an infinitesimal force. The system is allowed to re-equilibrate before further application of the force. Thus the systems path consists of a sequence of equilibrium states separated by these small displacements and any step can be reversed by application of an infinitesimal force. The equation of state is valid along a reversible path. (64 words). Question 1.5: Assume a protein denatures with a melting temperature of Tm=330K. Sketch the differential scanning calorimetry data i.e.  EMBED Equation.DSMT4 vs. T starting with a temperature T1<<330K to a temperature T2>>330K. Indicate the regions of the data where the structured form N is most stable, where the unstructured form D is most stable and where the D and N forms are in 1:1 equilibrium. Explain the appearance of the data. Answer:  The heat capacity of D is larger than N because the unstructured form has more degrees of freedom (motions, hydration sites, etc.) that can absorb heat. At Tm D and N are equally stable and together with the large number of partially structured forms that exist at this temperature, have the greatest capacity to absorb heat. Question 1.6: The Helmholtz (A) energy and Gibbs energy (G) are sometimes called free energies. In the old literature the Gibbs energy is called the free enthalpy. Why are the Gibbs and Helmholtz energies referred to as free? In your explanation, you may want to recall the definitions of A and G in terms of U, H, and TS. Explain also why the Gibbs energy G is so often discussed in chemistry and biochemistry texts. Answer: A=U-TS and G=H-TS. In each case we have an energy U or H (understood to be heat flow at constant V or P, respectively, diminished by a term TS, temperature times entropy. In the case of G, it is the amount of the enthalpy change of a system at constant P and T, that is free to produce useful work. The rest of the enthalpy is lost to entropy, which is represented in energy units by the TS terms, which accordingly is subtracted from the enthalpy H. Hence the term free enthalpy for the Gibbs energy, refers to the enthalpy freed for work. The same reasoning applies to A only at constant V and T. The Gibbs energy is of particular interest in chemistry and biochemistry because it quantifies reversible non-P-V work, produced at constant P and T, conditions that are common in chemical and biochemical system. A quantifies reversible work at constant V and T. Part 2: (20 points) Answer TWO of the FOUR questions. Answers longer than 200 words are acceptable. Equations may be used to illustrate your points but numerical calculations are not required. Physical reasoning based on thermodynamic principles is encouraged. Problem 2.1 The smelting of iron in a blast furnace occurs when carbon derived from coal reacts with oxygen to produce carbon monoxide gas CO. At the temperature of the blast furnace, particles of hematite Fe2O3 are reduced to pure iron in the stack of the furnace above the hot coal by reacting with the abundant CO gas according to:  EMBED Equation.DSMT4  . A chimney located in the top of the blast furnace stack allows hot gases to escape. In the 19th century, blast furnaces with enormously tall stacks were constructed with the idea that if hot CO gas could be retained for a longer time in the blast furnace before escaping through the chimney, more iron would be produced. Which Law of Thermodynamics makes this a bad idea? Explain. Answer: Solution: The reaction reaches equilibrium and at the high temperatures within the blast furnace, the equilibrium likely is far to the right, because the process gives us lots of iron. That said, allowing more time to have hot gases exposed to the hematite yields nothing because once the system reaches equilibrium, the second law says the entropy is maximized and further change is not going to happen. Building those big blast furnaces turned out to be a waste of time. Problem 2.2 An ideal monatomic gas with initial temperature T1 expands adiabatically into a vacuum thereby doubling its volume. Student A predicts that the change in the gas temperature is  EMBED Equation.DSMT4  while Student B predicts that DT=0. Explain each student s reasoning. Which student is correct? Justify your answer. Answer: The ideal gas expands adiabatically into a vacuum. Adiabatic so q=0. If it expands into a vacuum no work is done because Pext=0. Therefore,  EMBED Equation.DSMT4 . Therefore DT=0. Student B is correct. Student A is assumes incorrectly that the expansion is reversible and adiabatic. Student A uses the relationship: EMBED Equation.DSMT4 which is derived in turn from  EMBED Equation.DSMT4  and the ideal gas law P=RT/V. But the work is zero, so Student A has used the wrong equation to describe an irreversible expansion accompanied by no work. Problem 2.3. The van der Waals equation of state is  EMBED Equation.DSMT4 . The parameter a is due to attractive forces between molecules of the gas. The parameter b is due to repulsive forces, and represents the amount of the total volume that is occupied by a mole of gas molecules. In the internal energy equation  EMBED Equation.DSMT4 , where  EMBED Equation.DSMT4  for a van der Waals gas. Explain why  EMBED Equation.DSMT4  depends on a, but does not depend on b. Hint: This can be answered with a calculation but physical reasoning involving the meanings of a and b can also be used. Many students interpreted this question to be a request for a mathematical proof for  EMBED Equation.DSMT4 . If this was done by using the relationship  EMBED Equation.DSMT4  and the v.d. Waals equation of state, I gave full credit. But what I had hoped for was some physical reasoning. The parameter b represents the excluded volume of one mole of gas. Therefore the free volume is V-b. If the free volume changes we have DV=V2-b-(V1-b)=V2-V1. This means that the excluded volume is a constant and when you calculate the change DU with a volume change DV the excluded volume correction cancels. On the other hand a volume change will change internuclear interactions parametrized by a. Therefore  EMBED Equation.DSMT4  and there is no dependence on b. Problem 2.4 The Principal of Equipartition states that for every degree of mechanical freedom possessed by a molecule a factor of R/2 is contributed to the heat capacity CV, where R is the universal gas constant, i.e. R=8.314 JK-1mol-1. Therefore, a monatomic gas with three degrees of translational freedom has CV=3R/2, while a diatomic gas with has seven degrees of freedom and therefore has a heat capacity of CV=7R/2. Consider the table of heat capacities CP at T=298.15K taken from the back of your text: GasHeliumNitrogenOxygenNeonHydrogenArgonCP (JK-1mol-120.7929.1329.3820.7928.8420.79Which of these gases has a heat capacity that is predicted by the Principle of Equipartition? Explain your reasoning and account for any discrepancies. Assume the gases behave ideally. Answer: He, Ne, and Ar are monatomic gases and their heat capacities are all  EMBED Equation.DSMT4  The monatomic gases therefore obey the equipartition principle. Nitrogen, oxygen and hydrogen are diatomic gases and their heat capacities are  EMBED Equation.DSMT4  The diatomic gases have heat capacities about R less than predicted by the equipartition principle. This results because at T=298K the two vibrational degrees of freedom do not absorb heat and so the vibrational heat capacity is zero instead of R. Part 3 (30 points) Answer TWO of the following FOUR questions. Problem 3.1 Calculate q, w, DU and DS if one mole of an ideal monatomic gas initially at T=400K and P=1 atm expands adiabatically and reversibly until P=0.5 atm Solution:  EMBED Equation.DSMT4  Problem 3.2) The molar heat capacity at constant pressure (units of JK-1mol-1)for a certain gas is given by  EMBED Equation.DSMT4  If the gas increases its temperature from 100K to 500K at constant pressure, calculate the molar enthalpy change of the gas. Solution:  EMBED Equation.DSMT4  Problem 3.3 In this problem, you can chose which two out of three derivatives to evaluate. For water at T=300K and P=1 atm, The heat capacity  EMBED Equation.DSMT4 , the coefficient of thermal expansion  EMBED Equation.DSMT4  and the isothermal compressibility  EMBED Equation.DSMT4 . At T=300K the molar volume of water is  EMBED Equation.DSMT4 . Calculate two of the following three quantities for water at T=300K and P=1atm :  EMBED Equation.DSMT4  Solution:  EMBED Equation.DSMT4   EMBED Equation.DSMT4  Problem 3.4 Ammonia is a common metabolic by-product. It is also very toxic so terrestrial animals convert ammonia to urea: NH2CONH2. Consider the synthesis of urea from its constituent elements:  EMBED Equation.DSMT4  The table below shows entropy values at for T=298K and heat capacity values for each reaction component. Substance EMBED Equation.DSMT4  EMBED Equation.DSMT4 C(gr)5.698.64N2(g)191.4929.12O2(g)205.0329.36H2(g)130.5928.84Urea(s)104.693.13 Calculate the entropy change for this reaction at T=310K. Assume all heat capacities are constant between 298K and 310K.  EMBED Equation.DSMT4  Part 4 (32 points) Perform ONE out of the TWO multi-step calculations Problem 4.1 The shells of marine organisms contain calcium carbonate CaCO3, largely in a crystalline form known as calcite. There is a second crystalline form of calcium carbonate known as aragonite. Physical and thermodynamic properties of calcite and aragonite are given below. Properties (T=298K, P=1atm)CalciteAragonite EMBED Equation.DSMT4  (kJ/mole)-1206.87-1207.04 EMBED Equation.DSMT4  (kJ/mole)-1128.76-1127.71 EMBED Equation.DSMT4  (J/mole K)92.8888.70 EMBED Equation.DSMT4  (J/mole K)81.8881.25Density (gm/mL)2.7102.930 Based on the thermodynamic data given, would you expect an isolated sample of calcite at T=298K and P=1 atm to convert to aragonite, given sufficient time. Explain. Solution:  EMBED Equation.DSMT4   EMBED Equation.DSMT4  so the process will not occur. Suppose the pressure applied to an isolated sample of calcite is increased. Can the pressure be increased to the point that isolated calcite will be converted to aragonite? Explain. Solution: By La Chateliers Principle, an increase in pressure will favor the crystalline form with the higher density, i.e. the smaller molar volume. This would be aragonite. What pressure must be achieved to induce the conversion of calcite to aragonite at T=298K. Assume both calcite and aragonite are incompressible at T=298K. Solution:  EMBED Equation.DSMT4  Can isolated calcite be converted to aragonite at P=1 atm if the temperature is increased? Explain.. Solution: EMBED Equation.DSMT4   $LMX\]^rz~           3 4 = ? 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Because  EMBED Equation.DSMT4 ,  EMBED Equation.DSMT4  will become more positive as T increases. Problem 4.2 18 grams of water ice at 230 K are placed in thermal contact with a large heating block maintained at a temperature of 350 K. Calculate the entropy change DS, the energy change DU, and the enthalpy change DH of the water, when 18 grams of water ice at 230 K are converted to liquid water at 350K. Also calculate the entropy change of the heating block as a result of this process and the entropy change of the universe as a result of this process. For ice Cp=37.7 J/K. For liquid water Cp=75 J/K. For water DHfusion=6.01 kJ/mole. Assume the density of ice is 0.92 gm/mL and approximately constant between 230K and 273K. The density of liquid water is 1 gm/mL at 273K and approximately constant up to 350K. Assume only P-V work occurs. The external pressure is 1 atm. 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