12.6 Results from a soil-vapor study showed a soil-vapor concentration for vinyl chloride of 1500 ppmv. Use Henry's law to estimate the surrounding liquid- phase VC concentration.
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- The experimental data in the table was collected during a freezing point depression study where BHT (butylated hydroxytoluene) was the solvent. Mass Mass of BHT of unknown 8.526 g 1.316 g Use this data to calculate the molar mass of the unknown solute. molar mass= 16962 Incorrect psy HW 3.pdf Freezing point of pure BHT 74.60 °C APA Title Page -....doc Freezing point of BHT and unknown solution 71.69 °C PSY Final Project....pdf A K₁ for BHT 6.83 °C/m g/mol SHWater and 1-butanol are only partially miscible, so that when the two liquids are mixed, separate phases are formed. A mixture is prepared, in which the volumes of the aqueous and organic phases are equal. Ethanoic acid is then added to the mixture. The concentration in the aqueous phase is 0.094 mol dm-3 and in the organic phase 0.014 mol dm-3 . Additional solvent is then added such that the volume of the aqueous phase becomes double that of the organic phase. What are the new concentrations?Hexanoic acid was added to an immiscible biphasic solvent sysem, water and CCl4 at 20.0OC and the equilibrium concentrations of hexanoic acid were determined to be 3.66 g/L in H2O and 67.0 g/L in CCl4. Caluclate the distrubution coeffiecent (D1) of hexanoic acid in CCl4 with respect to water.
- Hexanoic acid was added to an immiscible biphasic solvent system, water and CCl4 at 20.0OC and the equilibrium concentrations of hexanoic acid were determined to be 3.66 g/L in H2O and 67.0 g/L in CCl4. Caluclate the distrubution coeffiecent (D2) of hexanoic acid in water with respect to CCl4.3. Refer to the phase diagram depicted below: When 7 moles of A and 3 moles of B are mixed at 50oC which is then cooled to 10oC the sample turns into two liquid phases, phase I has mole fraction xB=0.14 (see diagram below). Find the phase II mole fraction xB, and then calculate the ratio of amount of substance in phase I to that in phase II using Lever rule. Please enter your answer as a number with two decimals. for example, if the ratio you calculated is 2:3, you enter as 0.67One technique for studying the energetics of protein structure is to monitor the struc- ture of the protein as a function of the osmotic pressure. In these experiments the os- motic pressure of the solution is varied by using polymers of different molecular weight and concentration. In an experiment poly(ethylene glycol) (PEG) with a molecular weight of 1000.0 g mol- was used. What concentration of PEG is needed to create an aqueous solution with an osmotic pressure of 150.0 Pa at 25°C? You may assume that PEG is uncharged and that it does not dissociate or aggregate.
- Q3/ Caleulate the solubility parameter for amorphous polylactie acid, which has a density of 1.21g/cm3. Also, identify the best solvent for molecular weight determination. Explain your reasoning. Note that the density for acetone, ethyl acetate, and tetrahydrofuran are 0.791,0.902, and 0.889 g/cm3, repsectivily. Note H-1 g/mole, C-12 g/mole, N-14 g/mole, and 0-16 g/mole. CH3 -H polylactic acid (C3H402)n но Aceton:C3H60 ethyl acetate :C4H8O2 tetrahydrofuran :C4H80 人人 Group Molar Attraction Constant Fin (MPa) cm' mol -CH, 420 --CH, - 280 >CH- 140 >C< 0. P-phenylene 1377 -0- 256 -CO- 685 -COO 512GRAVIMETRIC ANALYSIS The addition of dimethylglyoxime, H2C4H602N2, to a solution containing nickel(Il) ion gives rise to a precipitate: Nickel dimethylglyoxime is a bulky precipitate that is inconvenient to manipulate in amounts greater than 135 mg. The amount of nickel in a type of permanent-magnet alloy ranges between 22% and 38%. Calculate the sample size that should not be exceeded when analyzing these alloys for a nickel.1. Part A Solution temperature = 24 °C Conductivity of instrument grade water = 1.043 uScm! Conductivity of deionised water = 1.74 µScm! Conductivity of tap water = 330 μScml On the basis of data above comment on conditions of the different water grades. 2. The experimental data for electrolytes in Part B are given below: Electrolyte c (M) K (ms.cm') HC1 0.01 5.06 KCI 0.01 1.415 NaCl 0.01 1.236 CaCl2 0.01 2.30 КОН 0.01 2.29 CH3OH 0.01 0.003 K2SO4 0.01 2.65 Calculate molar conductivity A of each electrolyte solution in Sm/mol above. Correct for the conductivity of deionized water.
- A simple distillation flask (V=2L) is initially charged with 320 moles of a solution consisting of 40 mole ethanol (A) and 60 mole % water (B). This solution is evaporated at a constant rate of 1.6 moles/min. The vapor is then condensed and collected in separate flask as distillate. Determine mole fraction of ethanol in the distillate when three-fifth (3/5) of the solution is evaporated and condensed. The equilibrium relation between XA (mol fraction of A in liquid phase) and ya (mol fraction. of A in vapor phase) is: Y/XA=2 Lütfen birini seçin: a.0.620 b.0.580 c.0.660 d.0.690 e.0.560Kk.20.Why is the molar fraction of methylbenzene is greater in vapor than its liquid