Honey bees
1. The partial molar volumes of acetone and chloroform are 74.16 cm3 mol-1 and 80.23 cm3 mol-1 respectively. Calculate the volume of a mixture containing 25.00 moles of acetone and 75.00 moles of chloroform.
2. Acetone has a molar mass of 58.1 g mol-1 and a density of 0.787 g cm-3. Chloroform has a molar mass of 119.4 g mol-1 and a density of 1.499 g cm-3. Estimate the volume of the above mixture using this information.
3. Calculate the molal freezing point depression constant Kf for 1-octadecanol using: Tf = 57.95 oC, Hfus = 74.047 kJ mol-1, and M = 270.5 g mol-1. ΔTf = Kf m
4. A polymer chemist dissolves 20.00g of polystyrene in 1.000L of benzene. The solution is found to generate an osmotic pressure of 1.000 kPa at 298.0K. Calculate the average molecular weight of the polystyrene. Recall that one Pascal x Meter3 equals one Joule.
5. Ex. 5.22(a)
6. Examine Figure 5.35. Assume the total mass of the mixture is 100g. Also assume l = 6.0 mm and l = 18.0 mm. Use this information to calculate the number of grams of material in the phase.
7. Attached is a temperature-composition plot with temperature in oC on the vertical axis and x = mole fraction liquid and y = mole fraction vapor on the horizontal axis. At a temperature of 114 oC what is the composition of the liquid according to this plot?
8. Examine Figure 5.38. Assume the boiling point for pure B is 120oC, for the azeotrope is 135oC, and for pure A is 80oC. Assume the azeotropic composition is 0.50 mole fraction A. (a) Draw a rough graph of temperature versus volume of liquid collected for a distillation starting with 100 mL of liquid having composition 0.60 mole fraction A.
9. Examine Figure 5.51. Assume the melting point of pure A is 102oC, of the eutectic is 80oC, and of pure B is 110oC. Assume cooling ends when the temperature drops to 50oC. Draw the cooling curve for composition a (assume a2 occurs at 104oC).
10. Identify
2. Acetone has a molar mass of 58.1 g mol-1 and a density of 0.787 g cm-3. Chloroform has a molar mass of 119.4 g mol-1 and a density of 1.499 g cm-3. Estimate the volume of the above mixture using this information.
3. Calculate the molal freezing point depression constant Kf for 1-octadecanol using: Tf = 57.95 oC, Hfus = 74.047 kJ mol-1, and M = 270.5 g mol-1. ΔTf = Kf m
4. A polymer chemist dissolves 20.00g of polystyrene in 1.000L of benzene. The solution is found to generate an osmotic pressure of 1.000 kPa at 298.0K. Calculate the average molecular weight of the polystyrene. Recall that one Pascal x Meter3 equals one Joule.
5. Ex. 5.22(a)
6. Examine Figure 5.35. Assume the total mass of the mixture is 100g. Also assume l = 6.0 mm and l = 18.0 mm. Use this information to calculate the number of grams of material in the phase.
7. Attached is a temperature-composition plot with temperature in oC on the vertical axis and x = mole fraction liquid and y = mole fraction vapor on the horizontal axis. At a temperature of 114 oC what is the composition of the liquid according to this plot?
8. Examine Figure 5.38. Assume the boiling point for pure B is 120oC, for the azeotrope is 135oC, and for pure A is 80oC. Assume the azeotropic composition is 0.50 mole fraction A. (a) Draw a rough graph of temperature versus volume of liquid collected for a distillation starting with 100 mL of liquid having composition 0.60 mole fraction A.
9. Examine Figure 5.51. Assume the melting point of pure A is 102oC, of the eutectic is 80oC, and of pure B is 110oC. Assume cooling ends when the temperature drops to 50oC. Draw the cooling curve for composition a (assume a2 occurs at 104oC).
10. Identify