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The plate height in a particularly packed gas chromatography column is characterized by the van Deemter equation with parameters: A= 1.50 mm, B= 25.0 mm ml/min, and C = 0.0250 mm min/mL.
a) Please use spreadsheet to construct a graph of plate height versus flow rate (u in the unit of mL/min) and find the optimum flow rate for minimum plate height.
b) Also using the graph, please determine the appropriate range of the flow rate in order to achieve a plate height of 4.00 mm?
The activation energy for the isomerization of cyclopropane topropene is 274 kJ/mol. By what factor does the rate of this reaction increase as the temperature rises from 260 to 286oC
A ruby laser produces radiation of wavelength 633 nm in pulses with a duration of 1.00*10^-9s. If the laser produces 0.475 J of energy per pulse, how many photons are produced in each pulse?
If 0.120 L of 15 mM Na6Si2O7 is allowed to evaporate until the volume is reduced to 30.0 mL, what will be the concentration of sodium ions in the concentrated solution
Indicate whether the potassium acetate salt, CH3CO2K is (A) acidic, (B) basic, (N) neutral
The vapor pressure of pure water at 98 degrees C is normally 707.3 mmHg, but decreased to 690.3 mHm upon addition of an unknown amount of copper (II) nitrate, Cu(NO3)2, to 166.6 g of water at this temp. How many grams of copper (II) nitrate were a..
Identify the nucleophile as well as electrophile involved in the rate-determining step of the synthesis of trans-p-anisalacetophenone. As well, state net balanced equation of the reaction.
If you had a pH of 7.0 in the body, how much ammonia from the kidney would you need to add to get to a pH of 7.38? Assume there's five liters of blood in the body. Essentially you're taking away protons with the use of ammonia.
A gamma ray has a frequency of 3.5 x 1019Hz. Determine the wavelength of this radiation in nm and the energy of a photon of this radiation.
A container has a mass of 78.91 grams when empty and 92.44 g when filled with water. The density of water is 1.000 g/cm3. Calculate the volume of the container. When filled with an unknown liquid, the container has a mass of 88.42 grams. Calculate..
Question- Use the following given enthalpies to find the enthalpy of reaction for the unknown reaction. Given: Fe2O3(s) + 3 CO(g) --> 2 Fe(s) + 3 CO2(g) DeltaH= -26.7 kJ
a solution is prepared by dissolving 1.98 g of an unknown nonelectrolyte in 21.00 g of cylcohexane tf 6.6 oc and kf
Consider the titration of 40.0 mL of 0.171-M of KX with 0.141-M HCl. The pKa of HX = 10.89. Give all pH values to 0.01 pH units. a) What is the pH of the original solution before addition of any acid
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