vap H = RT 1T 2 = kj mol kpa = 341 K


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1 Thermodynamics: Examples for chapter The boiling point of hexane at 1 atm is 68.7 C. What is the boiling point at 1 bar? The vapor pressure of hexane at 49.6 C is kpa. Assume that the vapor phase obeys the ideal gas law and that the molar volume of the liquid is negligible compared to the molar volume of gas. First we need to calculate vap H. The ClausiusClapeyron equation in the lecture notes gives T 1 = 49.6 C = K, P 1 = kpa; T 2 = 68.7 C = K, P 2 = 1 atm = kpa: ln P2 P 1 = vap T 2 T 1 RT 1 T 2 vap H = RT 1T 2 T 2 T 1 ln = kj mol 1 P2 Now that we know vap H, we can proceed in calculating T 1 when P 1 = 1 bar = 100 kpa and T 2 & P 2 are given above: P 1 = T 2 vap H T 1 = RT 2 ln P 2 /P 1 + vap H K J mol K J K 1 mol 1 ln kpa 100 kpa = 341 K J mol 1 2. Liquid mercury has a density of g cm 3 and solid mercury g cm 3, both measured at the melting point C and 1 bar pressure. The heat of fusion is 9.75 J g 1. Calculate the melting points of mercury under a pressure of a 10 bar and b 3540 bar. The experimentally observed melting point under 3540 bar is 19.9 C. Apply the Clapeyron equation see lecture notes: dp dt = fush T V = fush T Vl V P s T 1 fush T Vl V s
2 T P T Vl V s fus H T Vl T P V s fus H The following were given: fus H = 9.75 J g 1, V 1 = 1/ρ = cm 3 g 1 = m 3 g 1, V s = m 3 g 1, T = C = K. In a P = 10 bar 1 bar = 9 bar = Pa and in b P = 3540 bar 1 bar = 3539 bar = Pa. Inserting the numerical values, we get a T = K, which implies T b = C C = C. In b we have: T = 22.0 K, which implies T b = C C = 16.9 C. 3. From the r G 3110 J mol 1 for the gas of Br 2 g at 25 C, calculate the vapor pressure of Br 2 l. The pure liquid at 1 bar and 25 C is taken as the standard state e.g., f G = 0 for the liquid. Assume that Br 2 g follows the ideal gas law. The reaction is: Br 2 l = Br 2 g. r G for this reaction is given by the difference in the standard Gibbs formation energies: r G = f G Br 2 g f G Br 2 l = 3110 J mol 1. Based on the lecture notes: r G = RT lnk with K = abr 2g abr 2 l } {{ } =1 Solving this equation for P Br2 gives: = P Br 2 P P Br2 = P exp rg = 1 bar RT 3110 J mol 1 exp J K 1 mol 1 = bar K 4. A binary mixture of A and B is in equilibrium with its vapor at constant temperature and pressure. Prove that µ A g = µ A l and µ B g = 2
3 µ B l by starting with G = Gg+Gl and the fact that dg = 0 when infinitesimal amounts of A and B are simultaneously transferred from the liquid to the vapor. Because G = Gg+Gl and dg = 0, we have: dg = dgg+dgl = 0. Furthermore, for both liquid and gas, we have: dgl = µ A ldn A l + µ B ldn B l dgg = µ A gdn A g + µ B gdn B g Because dn A l = dn A g and dn B l = dn B g, we get: dg = dgl+dgg = µ A g µ A l dn A g+µ B g µ B ldn B g = 0 Both dn A g and dn B g can be varied independently, which means that the coefficients in front of them must both be zero: µ A g µ A l = 0 and µ B g µ B l = 0 µ A g = µ A l and µ B g = µ B l 5. One mole of benzene component 1 is mixed with two moles of toluene component 2. At 20 C, the vapor pressures of benzene and toluene are 51.3 and 18.5 kpa, respectively. a As the pressure is reduced, at what pressure will boiling begin? b What will be the composition of the first bubble of vapor? Assume that the mixture follows Raoult s law and that the gas phase is ideal. a Based on the lecture notes: P = P 2 + P 1 P 2 x 1 where P is the total vapor pressure of the liquid and P 1 and P 2 are the vapor pressure of pure liquids 1 and 2, respectively. Here x 1 = 1/1 + 2 = 1/3. The total vapor pressure can now be calculated as: P = P 2 +P 1 P 2 x 1 = 18.5 kpa+51.3 kpa 18.5 kpa 1 3 = 29.4 kpa The liquid will boil when the external pressure is reduced below 29.4 kpa. 3
4 b We use the following equation from the lecture notes: y 1 = x 1 P 1 P 2 + P P 1 P 2 x 1 where x 1 is the mole fraction of component 1 in the liquid and y 1 in the gas phase. The first drop will have the same composition as the gas. Inserting the numbers, we get: y 1 = 1/351.3 kpa 18.5 kpa kpa1/3 = Calculate the solubility of naphthalene at 25 C in any solvent in which it forms an ideal solution. The melting point of naphthalene is 80 C, and the enthalpy of fusion is kj mol 1. The measured solubility of naphthalene in benzene is x 1 = Assume that this forms an ideal solution. Use the following equation from the lecture notes: = exp [ [ x 1 = exp fusha R J mol J K 1 mol 1 1 T 1 T fus,a ] K K ] = The addition of a nonvolatile solute to a solvent increases the boiling point above that of the pure solvent. What is the elevation of the boiling point when 0.1 mol of nonvolatile solute is added to 1 kg of water? The enthalpy of vaporization of water at the boiling point is 40.6 kj mol 1. Assume that this forms an ideal solution. The following formula was given in the lecture notes: T b = RT vap,a 2 x vap HA B = K b m B where K b = RT vap,a 2 M A vap HA 4
5 First we calculate K b : K b = 8.314J K 1 mol K kg mol J mol 1 = K kg mol 1 Then: T b = K b m B = K kg mol mol 1 kg = K 8. For a solution of water component 1 and ethanol component 2 at 20 C that has 0.2 mole fraction of ethanol, the partial molar volume of water is 17.9 cm 3 mol 1 and the partial molar volume of ethanol is 55.0 cm 3 mol 1. What volumes of pure ethanol and water are required to make exactly 1 L of this solution? At 20 C the density of ethanol is g cm 3 and the density of water is g cm 3. The molecular weights of water and ethanol are and g mol 1, respectively. The total volume of the mixture is given by: V = n 1 V1 + n 2 V2. Since we have 0.2 mole fraction of ethanol, we must have 0.8 mole fraction of water. Thus n 1 = 0.8/0.2 n 2 and the total volume is then V = n 2 4 V1 + V 2. The molar volumes were given: V1 = 17.9 cm 3 mol 1 and V 2 = 55.0 cm 3 mol 1. The total volume sought is 1000 cm 3 = 1 L. Solving for n 2 the amount of ethanol gives: n 2 = V 4 V 1 + V 2 = 1000 cm cm 3 mol cm 3 mol 1 = 7.90 mol The amount of water is given by: n 1 = 4 n 2 = 31.6 mol. Next we convert moles to grams and finally to volume cm 3 : m 1 = n 1 M 1 = 31.6 mol 18.0 g/mol = 569 g m 2 = n 2 M 2 = 7.90 mol 46.1 g/mol = 364 g Conversion to volume by using the given liquid densities: V 1 = 569 g = 570 cm g cm 3 5
6 V 2 = 364 g = 461 cm g cm 3 Note that adding these volumes directly does not yield 1000 cm 3. Upon mixing the solution shrinks by 31 cm 4 at 20 C. 9. Calculate r G for H 2 Og, 25 C = H 2 Ol, 25 C. The equilibrium vapor pressure of water at 25 C is kpa. Activity of pure liquid is one and hence the equilibrium constant K = 1/P/P = This gives r G directly: r G = RT lnk = J K 1 mol K ln = 8.56 kj mol 1 6
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