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Question 1: Two chromatographic columns (GC) are being compared for use in an analysis. One is a 50 cm long packed column that is 5 mm in inside diameter (ID), with a stationary phase that is 1um thick on the support packing and has a total of 25,000 theoretical plates. The other column is 1 meter long, also 5 mm ID, with the same thickness of stationary phase on the support, and has 40,000 theoretical plates. Ignoring any other variables:
a) Which column would provide the best separation of sample peaks? Why?b) Which column would provide the sharpest peaks? Why?c)If the 50 cm column had a stationary phase thickness of 2 um on the support, how would that affect the results? (Hint-"C" factor of Van Deemter Eq.)
Question 2: The use of an FTIR Transducer has never become commonly used as a detector for HPLC because?
Question 3: In High Resolution Carbon NMR Spectroscopy, the phenomenon of "Spin-Spin Coupling" is rarely seen and, if seen, is very minor. Very briefly, why is this true?
The heat of vaporization of a liquid is the energy required to vaporize 1.00 mol of a liquid at its boiling point. In one experiment, 60.0 g of liquid nitrogen (boiling pt = -196C) is poured into a Styrofoam cup containing 200.0 g of water at 55.3..
carboxylic acids react with alcohols to form esters which are found in all plants and animals. what is the percent by mass of carbon in each of the following esters?
What is the pressure in a 65.0L cylinder filled with 0.235 moles of nitrogen gas at a temperature of 105K.
Chemistry - Analytical Chemistry - Molar Mass, An aqueous solution is made by dissolving 33.2g of the compound in 250mL of water. The solution has an Osmotic Pressure of 1.2 atm
Acetone, the solvent in some nail polish removers, has a density of 0.791 g/mL. What is the volume of 20.4 g of acetone?
Define the possibility of stereoisomers exists, However, the addition of bromine to an equimolar mixture of cis- and trans-2-butene generates only three stereoisomers. Explain.
A sample of 0.50 moles of O2 gas initially at 250K and a pressure of 1.0 atm is compressed to final pressure of 12 atm. The compression can occur via two different paths
when carbon is burned in the presence of oxygen, the carbon and oxygen combine to produce carbon dioxide. if you start with 3 grams of carbon and 8 grams of oxygen and they react completely, how many grams of carbon dioxide will be produced?
Talc (used in talcum powder) has masscomposition 19.2% Mg, 29.6% Si, 42.2% O,and 9.0% H. What is the empirical formula of the compound
What volume of O2 at 684 mmHg and 21 degree celsius is required to synthesize 25.0 mole of NO?
N2O4(g) + KCl(s) → NOCl(g) + KNO3(s) Find out oxidation number of each and find which one is reduced and which one is oxidized by Using oxidation number concept? Also write net ionic equation and ionic equation.
Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s)+H2SO4(aq) 2HCl(g)+Na2SO4(s) How many grams of HCl can be prepared from 2.00 mol H2SO4 and 150g NaCl.
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