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Synthesis of a Liquid Crystal
experiment in which added 500 mg of cholesterol to 1.5 mL of dry pyridine. Then added 1.7 mmol of benzoyl chloride and heated the mixture.
Questions:1. Explain two reasons why pyridine was used in this experiment.2. Do spherical molecules exhibit liquid crystalline behavior?3. Could either a primary or a secondary amine be used in this experiment in place of pyridine? Why of why not?
If a 2.1 L reaction vessel initially contains 725 torr of cyclopropane at 485 degrees C , how long will it take for the partial pressure of cylclopropane to drop to below 102 torr .
For the reaction, A = B + C, the rate law is k[A]. If it takes 80.0 seconds for 70.0% of a 10.0 gram sample of A to be transformed into products, what is the value of the rate constant.
Using the following equation: 2AgNO3+MgBr2->2AgBr+Mg(NO3)2 calculate the moles of silver bromide and magnesium nitrate produced by 85 mol of magnesium bromide reacting with silver nitrate.
Determine the molecular formula of the compound with molar mass 336.5g mol-1 and empirical formula C 5 H 8 O?
If 6.15 mol of ethane (C2H6) undergo combustion according to the unbalanced equation C2H6 + O2 -! CO2 + H2O, how much oxygen is required
Determine what volume of 1.0 mol/L solution of Copper monosulfide can be made from 23.9 grams of Copper monosulfide?
which hydroxide precipitates first as NaOh is slowly added to the solution? b) what is the molar concentration of the first cation precipitated when the other cation just starts to precipitate out of solution?
Write an equation for the formation of an acetal from reaction of excess methanol with benzaldehyde in the presence of an acid catalyst.
The plasma (HCO3-) of an individual living at a high elevation is 18.5 meq/L. If this concentration of bicarbonate fully compensates the decrease
How many grams of methanol must be added to 7.50kg of water to lower its freezing point to -15.0^circ C? For each mole of solute, the freezing point of 1 {rm kg} of water is lowered 1.86 ^circ {rm C}
Calculate the ratio of rates of effusion of O2 versus Cl2. Record your answers to three significant figures. The concentration of CO2 in the atmosphere is 375ppm (by volume). What is the mole fraction of CO2 in the atmosphere?
A 250 mL stock solution contains 2.3 M Ca(CN)2. When 100 mL of the stock solution is diluted to 125 mL, how many moles of CN- ions will be contained in the dilute solution.
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