13.5 Which of the following is the best representation of a sat- urated solution? Explain your reasoning. [Section 13.2 -h yW. s) 279 VOV (b) 0: (c) ur 938 (a) RCTAG DOIUD
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- The freezing point of 0.20 m HF is -0.38C. Is HF primarily nonionized in this solution (HF molecules), or is it dissociated to H+ and F- ions?What is the freezing point (in oC) of a solution prepared by dissolving 11.3 g of Ca(NO3)2 (formula weight = 164 g/mol) in 115 g of water? The molal freezing-point depression constant for water is 1.86oC/m.Methanol (CH₃OH) and ethanol (C₂H₅OH) are miscible be-cause the major intermolecular force for each is hydrogen bond-ing. In some methanol-ethanol solutions, the mole fraction ofmethanol is higher, but the mass percent of ethanol is higher. Whatis the range of mole fraction of methanol for these solutions?
- What mass of glucose (molar mass 180.16 g/mol, i=1) must be dissolved in 2.50 kg of solvent to lower the freezing point by 0.500 oC if the freezing point depression constant of the solvent is 9.51 oC/m?The partial pressure of O2 in air at sea level is 0.21 atm. Usingthe data in Table 13.1, together with Henry’s law, calculatethe molar concentration of O2 in the surface water ofa mountain lake saturated with air at 20 °C and an atmosphericpressure of 650 torr.When 13.66g of Lactic Acid (C3H6O3) are mixed with 115g of stearic acid (C18H36O2), the mixture freezes at 62.7oC. The freezing point of pure stearic acid is 69.4oC. What is the freezing depression constant of lactic acid?
- 1. What is the mole fraction of 40% phenol(C6H6O) in benzene (C6H6)? 2. In a solution of naphthalene (C10H8) in toluene (C7H8), the mole fraction of naphthalene is 0.2. What is the % by mass toluene and naphthalene in the solution?If 528 mg of an unknown sample was dissolved in 10.00 grams of t-butanol(C4H9OH) and the freezing point decreased by 3.46oC the apparent molar massfrom this data is6. An aqueous solution of hydrofluoric acid is 12.5 molal with respect to HF and has adensity of 1.070 g/mL at 25oC. Calculatea. mole fraction of HFb. %w/w of HFc. molarityd. molality
- 6 Caffeine, C8H10N4O2, is a stimulant found in tea andcoffee. A sample of the substance was dissolved in 45.0 gof chloroform, CHCl3, to give a 0.0946 m solution. Howmany grams of caffeine were in the sample10.0 grams of an unknown non-electrolyte is dissolved in 2.5 moles of water (kf=1.86 °C/m) and the change in freezing point is determined to be 4.13° C water, what is the molar mass of the unknown?What mass of glucose (molar mass 180.16 g/moles i=1) must be dissolved in 2.50 kg of solvent to lower the freezing point by .500° c if the freezing point depression constant of the solvent is 3.43°C/m?