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Once the absorbent is packed in a liquid chromatography column, it is important that the level of the elution solvent not drop below the top of the adsorbent why?
If 8.40 kJ of heat is needed to raise the temperature of a sample of metal from 15 degrees celsius to 20 degrees celsius, how many kilojoules of heat will be required to raise the temperature of the same sample of metal from 25 degrees celsius to ..
Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 8.00 of aluminum sulfate, Express the number of moles of Al, S, O, and atoms numerically, separated by commas.
An injection containing 10.0pg 10 5 B was injected into a patient suffering from a brain tumor. The patient was irradiated by a neutron gun at the site of the tumor.
If the concentration of Mg2+ ion in seawater is 1350 mg/L, what OH- concentration is required to precipitate Mg(OH)2
There are two naturally occurring isotopes of bromine. 79Br has a mass of 78.9183 amu. 81Br has a mass of 80.9163 amu.
In order to separate 261 mg of the sample with similar separation of the components, what size column, diameter and length, should be used? And what volume flow rate should be used?
105 cm3 of 2MSulphuric acid is required to neutralise 420 cm3 of potassium hydroxide. What is the concentration of potassium hydroxide?
thomas poured 25 mL of 0.50 M HCl into a large bottle. He then added enough water so that the new (diluted) concentration was 0.10 M HCl. How much water did Thomas add?
If the original sodium tartrate solution had a concentration of 1.00 M instead of .100 M, what would the concentration of copper be in a solution created by combining 10 mL of it with 10 mL of the copper (II) sulfate solution. Use the Ksp you foun..
a sample of Ringer's solution contains the following concentractions (mEq/L) of cations: Na 147, K 4 and Ca2 4. If CI- is the only anion in the solution,
C2H4+2O2= 2CO+2H2O if 2.70 mol C2H4 is reacted with 6.30 mol O2 a. identify the limiting reagent b. calculate the moles of water produced
one synthesize 2-hydroxy-3-(m-tolyl)propanoic acid and 1-amino-3-(m-toyl)propan-2-ol? One of the intermediates should be a cyanohydrin.
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