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

[answerhappygod]

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