An Introduction to Thermodynamics phần 8 pdf

... 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 the equation 2 ... concentrations, of the reactants and products. Not only ∆G and equilibrium constants can be determined electrochemically, but also ∆H and ∆S. From equation 21 and equation 30 of Chapt...

Ngày tải lên: 08/08/2014, 15:21

... 1.0 2 H O,25g 82 .2 66.2 -7 .8 0.125 1.0 2 Al, 50g 86 .35 66.35 -3.65 0.0050 0.22 Al, 25g 88 .12 68. 12 -1 .88 0.0276 0.22 * Temperatures in C. ∆T is the temperature change of the sample and o s ∆T is ... 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 i...

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... 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 measurements and calculations. Chemical ... reactions and phase changes are more often carried out at constant pressure than at constant volume. At constant volume (no work done) the energy change is equal to Q, th...

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... after mixing? There is no energy advantage for the yellow grains to move to the bottom, or back to the top, or to any other specific location. We know that, once mixed, there is close to zero (1) T Q S rev =∆ ... atoms), one way of 23 storing energy in the ball is to start it rolling. Another very large group of ways of storing energy in the ball is to let some of the atoms be...

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... consisting of constant pressure and constant temperature segments, or constant volume and constant temperature segments. It may be, too, that it will be simpler to return to equation 32. For example, ... -100.4 -96.9 H O g -241 .8 -2 28. 6 2 AgCl c -127.0 -109 .8 lq - 285 .8 -237.1 AgI c -61 .8 -66.2 H O g - 187 .8 -120.4 2 2 Ag O c -31.1 -11.2 lq -136.3 -105.6 2 Al O c -1675.7 -...

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... ) 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. For the reduction of ethylene with H to give ethane, 2 ... 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 connected to an identical vessel containing...

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... 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...

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... solids are 1 and the activity of the oxygen is 0.20 (equal to the pressure in atmospheres). ∆G = 10 ,84 0 +8. 314 x 2 98 ln (0.20) = 10 ,84 0 - 1,239 ln 5 ½ = 8. 846 kJ/mol The free-energy change for the ... only through ∆S, and therefore subject to an arbitrary additive constant. The change in free energy with temperature is thus also subject to an arbitrary additive constant,...

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... 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. ... 213. 78 NaOH c 64.5 2 CS g 237 .8 O g 205.15 2 2 Cl g 223.1 O g 2 38. 9 2 3 F g 202 .8 P red 22 .8 2 H g 130. 68 white 41.1 2 HBr g 1 98. 70 PH g 210.2 3 HCl g 186 .90 S rhombi...

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... 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