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Suppose you are attempting the separation of three compounds (A, B, and C) by column chromatography on silica gel. You start by running a number of TLC in order to find the best solvent system for the separation. The results are summarized in the table below.
Solvent Rf for A Rf for B Rf for CHexane 0.10 0.00 0.00Toluene 0.20 0.00 0.04Diethyl ether 0.51 0.18 0.28Ethyl acetate 0.81 0.45 0.60
a) How polar are the three compounds: low, medium, or highly polar (please estimate)?b) What would be the result of a column chromatographic separation if the column chromatography was to be performed in the following eluents:a) diethyl ether, or b) toluene.
What would be the pressure of the gas, in kPa, if it were transferred to a container at 24 degrees Celcius whose volume is 55.0 L.
prove the presence of the cations listed : Sn2+ , cd2+, Cu2+, Bi3+. write four paragraphs about these cations a paragraph each?
How many grams of water at 0oC could be frozen to ice at 0oC by the evaporation of 493 grams of isopropyl alcohol?
Calculate the mass of propylene glycol ({rm{C}}_3 {rm{H}}_8 {rm{O}}_2 ) that must be added to 0.340 kg of water to reduce the vapor pressure by 2.86 torr at 40 ^circ ,{rm C} (P_{{rm H}_2{rm O}} at 40 ^circ,{rm C} = 55.3;{rm torr}).
An an isothermal process, the pressure on 1 mol of an ideal monatomic gas suddenly changes from 4.00 atm to 100.0 atm at 25°C. Calculate w
If 110 {rm mg} of fluorine-18 is shipped at 8:00 A.M., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 P.M.
Mixed Aldol Each of the following compounds can be prepared by a mixed aldol condensation reaction. Give the structure of the aldehyde and/or ketone precursors for each aldol product and formulate the reaction.
At a certain temperature and pressure 2.1 L of H2 reacts with 2.1 L of I2. If all the H2 and I2 are consumed, what volume of HI, at the same temperature and pressure, will be produced?
sample of anhydrous salt sodium sulfate Na2SO4 is allowed to absord water to form the decahydrate salt.
What is the heat capacity of an empty glass mug weighing 300.0 g, and what quantity of heat is required to heat it from 25 oC to 75 oC?
If 93 of heat are added to a pure gold coin with a mass of 11 , what is its temperature change? Specific heat capacity of gold is 0.128?
Based on this equation, what is the value of the Rydberg constant (R) in m-1? (5 significant figures)
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