An Introduction to Thermodynamics phần 4 ppsx

... -858. CH g - 74. 6 -50.5 4 FeO c -272.0 - 244 .3 C H g 227 .4 209.9 2 2 Fe O c -8 24. - 742 .2 C H g 52 .4 68 .4 2 3 2 4 Fe O c -1118 .4 -1015 .4 C H g - 84. 0 -32.0 3 4 2 6 HBr g -36.3 -53 .4 CH OH g -201.0 ... because any work done by one part on the other can be compensated by such a transfer of thermal energy. 7/10/07 2- 40 Again consider a system constrained to constant...

Ngày tải lên: 08/08/2014, 15:21

... of statistical mechanics, it is possible to predict which substances are likely to be “apparent exceptions” to the third law and to calculate the exact amount of the discrepancy to be expected. ... 361-363 (1960), and R. Fowler and E.A. 3 Guggenheim, Statistical Thermodynamics, Cambridge, 1939, pp. 2 24- 227. 7/10/07 5- 116 Br lq 152.2 g 3 04. 4 2 g 245 .47 HNO g 266.9 3 C graphi...

Ngày tải lên: 08/08/2014, 15:21

... at constant volume from 25 C to 2 o 50 C. For a diatomic gas near room temperature, C is constant and is about 5/2 R = 21 o 4 V J/mol·K. The gas can do no work at constant volume so the total energy ... far, thermodynamics has been shown to be correct. Energy The first step in understanding thermodynamics, and making it serve your purposes, is to learn how to evaluate changes in...

Ngày tải lên: 08/08/2014, 15:21

... the change in such an equilibrium property, in going from one state to another, can depend only on the initial and final states. Mathematically, this means that the change, described by an integral, ... we do want to know. Our second step, therefore, in understanding an applying thermodynamics, is to learn how to define and calculate new variables that will simplify our measur...

Ngày tải lên: 08/08/2014, 15:21

... 2 ∆H = - 39, 240 - 25.9 x 24 - 11,780 - 23.7 x 70 - 29 .4 x 94 - 296,900 + 41 .9 x 94 J/mol 392 = - 349 .0 kJ/mol Note that temperature differences can be found without conversion to the Kelvin ... ethylene, C H , to form 2 4 cyclobutane, C H , would not readily occur quantitatively under conditions conducive to 4 8 measurement of the heat of reaction. But both ethylene and...

Ngày tải lên: 08/08/2014, 15:21

... The standard free energies of formation of ethylene (C H ) and of ethane (C H ) at 25 C and 2 4 2 6 o 1 atm are 68 .4 and -32.0 kJ/mol. The standard enthalpies of formation are 52 .4 and - 84. 0 kJ/mol. ... ln 7/10/07 2- 54 3. Find ∆S when 2 mol of an ideal gas at 25 C is expanded into vacuum to 10 times its original o volume. 4. A vessel containing 5 mol of an ideal gas, A, is c...

Ngày tải lên: 08/08/2014, 15:21

... important, for example, in the storage of gasoline, which is a mixture of many hydrocarbons. The storage tanks must be vented to the air and consequently water vapor can condense in the tanks. ... constituents, on the temperature, and on the pressure. Therefore the change in free energy arising from changes in any of these quantities can be written as the sum It is to be understood that e...

Ngày tải lên: 08/08/2014, 15:21

... )? 4 4 3 d. What is the molality of CCl in pure CCl ? 4 4 e. What is the molarity of an ideal gas at 1 atm and 25 C? o 9. A solution contains, by weight, 40 % water, 35% ethanol (C H OH), and ... equilibrium constant”) is rigorously constant! 7/10/07 4- 90 Equilibrium Constants At equilibrium, under constant temperature and pressure, the free-energy change is zero and equation 6 becom...

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... source of these ions than CaF . - 2 Inserting these symbols into the equation above gives 7/10/07 4- 1 04 3. The standard free energies of benzene and cyclohexane are 1 24. 5 and 28.5 J/mol at 25 ... decomposition of methanol, at this temperature and o constant volume, if the initial pressure of pure methanol is 5 atm. 7. Water and solid sulfur can react to form SO and H S according to...

Ngày tải lên: 08/08/2014, 15:21

... tortoise has moved 1 m. Each time Achilles runs the distance to where the tortoise had been, the tortoise will have moved to a new location, ahead of Achilles. Will Achilles ever catch the tortoise? What ... geometrically by an area. The second method may be called an antiderivative. Area. In section A.3 we looked at the equation for an ideal gas to find how one quantity changes...

Ngày tải lên: 08/08/2014, 15:21