50 g acetone (CH;COCH3) and 50 g methanol (CH3OH) are mixed to obtain a 100 g liquid solution at 25°C. Vapor pressures of acetone and methanol at 25°C are 271 mmHg and 143 mmHg, respectively. Assuming ideal mixing and evaporation behavior, calculate the followings: (a) Mole fractions of acetone and methanol in the solution. (b) Contribution of acetone and methanol to the total vapor pressure at 25°C. (c) The total vapor pressure at 25°C.
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- The mass ratio of the dissolution of an organic solute to benzene is 6.5:706.25 at 25°C and found to raise the boiling point by 0.469K. The specific gravity of benzene is 876.6. The vapor pressure of the pure solvent at 25 C is 103mmHg. Determine the following: (a] Freezing point of the solution (b) The ratio of the vapor prossure of the solution to that of solvent (c) The osmotic pressure (d) Moleculor weight of the organic soluteA solution is prepared by dissolving iodine, I2, in carbon tetrachloride, CCl4, at 25 °C. What is the mole fractions of the solute for a solute of molality 0.100 mol kg−1? (a) Mole fraction of solute = ________ 2 sig. fig. A solution is prepared by dissolving iodine, I2, in carbon tetrachloride , CCl4, at 25 °C. What is the mole fractions of the solvent for a solute of molality 0.100 mol kg−1? (b) Mole fraction of solvent = _____________. 3 sig. fig. A solution is prepared by dissolving iodine, I2, in carbon tetrachloride , CCl4, at 25 °C. For a solute of molality 0.100 mol kg−1, calculate the change in the chemical potential of the solvent caused by the solute. (c) change of chemical potential (solvent) = __________ J/mol. 3 sig. fig. R = 8.3145 J/Kmol.1. Ideal solution composition of A and B liquids at 80°C is 100 (for A) and 600 (for B) mmHg, respectively. (a) Construct the P-x phase diagram by calculating the compositions of the liquid and vapor phases. (b) 1.0 mole of solution with ZB= 0.60 at 80°C is in an open container and is evaporated until the total vapor pressure decreases by 20%. Calculate the number of moles of the liquid and vapor phases using the leverage rule.
- A polymer of large molar mass is dissolved in the organic solvent m-cresol (C7H8O) at 25 °C, and the resulting solution rises to a final height of 13.4 cm above the level of the pure solvent, as solvent molecules pass through a semipermeable membrane into the solution. If the solution contains 5.24 g polymer per liter, calculate the molar mass of the polymer. Take the density of the solution to be 1.03 g cm-3.A solution containing 6.314 g of a non-volatile organic solute dissolved in 100.00 g of toluene boils at 384.72 K at 1 bar of pressure. The boiling point of pure toluene is 383.75 K and AvapH = 38.06 kJ/mol for benzene. (a) What is the boiling point elevation constant for toluene? (units: kg.K/mol) (b) What is the molar mass (g/mol) of the unknown solute?The graph given below plots the (approximate) partial molar volumes of ethanol (black line) and water (red line) in units of ml/mole at 25°C in a mixture as a function of the mole fraction of ethanol. Use the information in this graph (note the different y axes for water and ethanol) and the densities at 25°C to calculate the resulting total volume of the g following two mixtures.(pethanol = 0.789 ml & PH20 = 0.998 ) ml a. 150 ml ethanol + 100 ml H2O b. 200 ml ethanol + 40 ml H2O H20 VELOH Vet o*HA -V ELOH V H2O T 0.8 1.0 0.2 0.4 0.6 0.0 XELOH 53 54 55 57 15 18
- A solution is prepared by dissolving 40.00 g of MgCl2 (f.w. = 95.211 g mol–1), a non-volatile solute, in enough water (m.w. = 18.02 g mol–1) to result in exactly 2 L of solution at 25 °C. Assume the density of the solution is that of pure water (dsolution = 1.000 g mL–1). The ebullioscopic constant (Kb) for water is 0.513 °C m–1. The cryoscopic constant (Kf) for water is 1.86 °C m–1. The vapor pressure of pure water is 0.0313 atm. Determine the freezing point of the solution.1. (a) In the experiment carried out to determine the degree of association of benzoic acid in benzene (C6H6), the cooling curves of pure benzene and benzoic acid solution prepared by dissolving 0.358 g benzoic acid in 20 mL of benzene were obtained by using Beckmann thermometer, calibrated before the experiment. The cooling curves are given in the figure below. Calculate the degree of association of benzoic acid in benzene for the given solution. Ky= 5.055 K kg.mol-¹, dbenzene- 0.876 g.cm³, MBenzoic acid=122.12 g.mol-¹ T(°C) 2.88 2.38 Benzene Solution t(min)In the determination of molar mass of an unknown substance by ebullioscopic constant, 30 ml of acetone (C3H6O) was placed in a test tube with thermometer and glass tubing and subjected to water bath. Upon boiling, the temperature reads 56 deg C. For the boiling point of unknown-acetone solution, you prepared the solution by mixing 1.60 g of unknown solute in the 30 mL acetone and subjected it again to water bath. The boiling temperature of the solution is 56.68 deg C. The density of acetone = 0.9849 g/mL and the Kb of acetone = 1.67 degC/kg 1. What is the value for delta Tb or the change in boiling temperature (in degrees Celsius)? 2. How many moles of solute is present in the solution given in the situation?
- There is a 15.85% by mass aqueous KCl (molecular weight 74.5513 g mol–1) solution at 25 °C. The density of the solution is that of pure water (dsolution = 1.000 g mL–1). The ebullioscopic constant (Kb) for water is 0.513 °C m–1. The cryoscopic constant (Kf) for water is 1.86 °C m–1. The vapor pressure of pure water is 0.0313 atm. Could you please find osmotic pressure?In the determination of molar mass of an unknown substance by ebullioscopic constant, 30 mL of acetone (C3H6O) was placed in a test tube with thermometer and glass tubing and subjected to water bath. Upon boiling, the temperature reads 56 deg C. For the boiling point of unknown-acetone solution, you prepared the solution by mixing 1.60 g of unknown solute in the 30 mL acetone and subjected it again to water bath. The boiling temperature of the solution is 56.68 deg C. The density of acetone = 0.9849 g/mL and the Kb of acetone = 1.67 degC/kgIn the determination of molar mass of an unknown substance by ebullioscopic constant, 30 mL of acetone (C3H6O) was placed in a test tube with thermometer and glass tubing and subjected to water bath. Upon boiling, the temperature reads 56 deg C. For the boiling point of unknown-acetone solution, you prepared the solution by mixing 1.60 g of unknown solute in the 30 mL acetone and subjected it again to water bath. The boiling temperature of the solution is 56.68 deg C. The density of acetone = 0.9849 g/mL and the Kb of acetone = 1.67 degC/kg What is the value for delta Tb or the change in boiling temperature (in degrees Celsius)? Final answer must be rounded off to 2 decimal places, and shall NOT have any unit.