2. The elemental analysis of an organic solid extracted from gum arabic (a gummy substance used in adhesives, inks, and

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2. The elemental analysis of an organic solid extracted from gumarabic (a gummy substance used in adhesives, inks, andpharmaceuticals) showed that it contained 40.0 percent by mass C,6.7 percent by mass H, and 53.3 percent by mass O. A solution of0.691 g of the solid in 30.1 g of the solvent diphenyl gave afreezing-point depression of 1.53°C. Calculate the molar mass andmolecular formula of the solid. (Kf for diphenyl is8.00°C/m.)molar mass:___ × 10 ___ g/mol(Enter your answer in scientific notation.)
3. Hemoglobin, the oxygen-transport protein, binds about 1.35 mLof oxygen per gram of the protein. The concentration of hemoglobinin normal blood is 150 g/L blood. Hemoglobin is about 95 percentsaturated with O2 in the lungs and only 74 percentsaturated with O2 in the capillaries. Calculate thevolume of O2 released by hemoglobin when 165 mL ofblood flows from the lungs to the capillaries.
4. Calculate the molalities of the following aqueoussolutions:(a) 0.936 M sugar (C12H22O11) solution (density of solution = 1.095g/mL)___ m(b) 1.21 M NaOH solution (density of solution 1.082 g/mL)___ m
(c) 2.92 M NaHCO3 solution (density of solution 1.077g/mL)___ m
5. Calculate the pressure of O2 necessary to generate an aqueoussolution that is 6.3 × 10−2 M in O2 at 25°C. The Henry's lawconstant for O2 in water at 25°C is 1.3 × 10−3 mol/L · atm.___ atm
6. Determine the molality of an aqueous solution that is 19.5percent urea by mass.___m
7. A 254−mL sample of a sugar solution containing 1.13 g of thesugar has an osmotic pressure of30.1 mmHg at 34.3°C. What is the molar mass of the sugar?___ g/mol
8. Calculate the vapor pressure of a solution made by dissolving235 g of urea[(NH2)2CO; molar mass 60.06 g/mol] in 455 g of water at 25°C.___ mm Hg (At 25°C, PH2O = 23.8 mmHg)
9. Be sure to answer all parts.What are the boiling point and freezing point of a 3.15 m solutionof naphthalene in benzene? (The boiling point and freezing point ofbenzene are 80.1°C and 5.5°C, respectively.)Boiling point:___°CFreezing point:___°C
10. How many liters of the antifreeze ethylene glycol[CH2(OH)CH2(OH)] would you add to a car radiator containing 6.75 Lof water if the coldest winter temperature in your area is −20.5°C?Calculate the boiling point of this water-ethylene glycol mixture.(The density of ethylene glycol is 1.11 g/mL.)What is the volume of antifreeze?___ LWhat is the boiling point of the solution?___°C
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