3. (2 pts) Why is eddy diffusion a larger contribution to plate height in packed column...
What is the plate height for a 10.0-cm HPLC column packed with 3.5 μm solid phase?
A GC column is operated under the following conditions: Column: 1.10 m x 2 mm packed with Chromosorb P and Carbowax 20M as stationary phase. The following retention times were obtained: air: 18.0 sec; methylacetate: 2.98 min; methyl propionate: 4.56 min. Peak width at half height: methylacetate: 7.7 sec; methyl propionate: 12.4 sec. Calculate: a) the corrected retention time for each solute. b) the capacity factor k' for each solute. c) the selectivity factor α for the pair of solutes....
Question 1 Which of the following is the advantage of straight packed column? Selected Answer: It can be repacked easily Answers It can be packed uniformly It can be repacked easily It is compact It is easier to heat it evenly Question 2 Which of the following statements most accurately describes thin-layer chromatography? Selected Answer: technique used to separate non-volatile mixtures, the mobile phase has different properties from the stationary phase. Answers The mobile phase is the solvent also called...
need help with number 2
HW #3 for Chem 318 Due: April 29, 2019 1. Solute A has a K 2.5 for an extraction between water (phase 1) and chloroform (phase 2). If 100 mL of a 0.01 fraction will be extracted? For the same solute and, what fraction will be extracted if 5 extractions wi 80 mL chloroform each are used (instead of one 400 ml extraction)? M solution containing solute A in water is extracted one time with...
B. (3 pts) The equilibrium vapor pressure (Pº) of ethyl acetate (MW = 88.11 g/mol) and butyl acetate (MW = 116.16 g/mol) at 25 °C are 121 Torr and 30.5 Torr, respectively. Determine the molar percent composition (mol %) of each component in the vapor above an ideal liquid solution containing 6.00 g of ethyl acetate and 18.0 g of butyl acetate. c. (3 pts) A mixture of methyl propanoate (1), 3-methoxy-1-propanol (2) and butyric acid (3) were detected in...
Problem 2 (25 pts.) A steel column has a total unbraced height of 20 ft and carries an axial LRFD load of 500 kips. The column ends are fixed. Select an economical HSS 8x8 for this column.
i just need help with 2 & 3 & 4. please explain and
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8. Rf value of compound on a TLC plate: h. "Like dissolves like" 2. What does one achieve by doing Thin Layer Chromatography or a column chromatography on a mixture of organic compounds? o 3. What is the basis of separation of two or more organic compounds when they are subjected to TLC? ano 4. Unexpected result: Why do you think the elution sequence of the...
10 Which one of the following statements is true? A column is a load bearing masonry member in which the larger dimension does not exceed 4 times the height of the member 2 The lateral support will restrain any masonry element against vertical movement 3The shear span is the ratio of the max design bending moment to the maximum design load All of the above None of the above 4 5 Total [10]
10 Which one of the following statements...
Mass of Magnesium Volume of gas produced Height of water column Trial 2 0.03029 Trial 1 0.03309 34.4mL 18.26cm 21.7 mmity 23.5°C 751 torr Pressure of water column Temperature of water Atmospheric pressure 23.76 mm Hg 25.0°c 751 torr Water vapor pressure CALCULATIONS: Perform calculations for both trials. 1. Calculate the total pressure of the gases inside the eudiometer at the end of the experiment. Trial 1 Trial 2 2. Calculate the partial pressure of the hydrogen gas in the...
Molecular Weight Why is the Mw of a polymer always larger than the Mn of the 2. same polymer sample 3. What is Poly Dispersity (PD) What is the Degree of Polymerisation (DP) 4.
Molecular Weight Why is the Mw of a polymer always larger than the Mn of the 2. same polymer sample 3. What is Poly Dispersity (PD) What is the Degree of Polymerisation (DP) 4.