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calculate concentration of chromate ion (CrO4) in a 0450 M solution of chromic acid (H2CrO4). (for chromic acid, Ka = .18, Ka2 = 3.2 x 10E-7)
what is steam distillation and why is it a preferred technique to purify high boiling liquids that are water-insoluble
calculate the moles of aluminum ions present in 250.0 g aluminum oxide. acetaminophen a common aspirin substitute has
A 9.775 g. gaseous mixture contains ethane (C2H6) and propane (C3H8). Complete combustion to form carbon dioxide and water requires 1.120 mol of oxygen. Calculate the mass percent of ethane in the original mixture.
Calcultae the observed rotation of a mixture of + and - tartaric acid containing 60% of the S isomer
Calculate the average molecular weight of a gaseous mixture with the following composition on a mole % basis: CH4= 30%, H2= 10% and N2= 60%.
Hydrocarbon chemistry problems, For the compound, 1,2-dibromoethane, the most stable conformation would be
how many rads does a 81- kg human receive each year from the approximate 10^-8 grams of 14 C naturally present in her body? (t 1/2 = 5,730 yr; each disintegration releases 0.156 MeV.)
Write the Nernst equation for this reaction, and then replace the molality of H+ with a relation using Kw and the molality of OH-. Rearrange this expression to solve for pKw (=-logKw) in terms of the standard and measured cell potentials and the g..
hot methanol and then stored the recrystallization solution until the next lab period. What possible effect on your results due to this experimental error could take place?
Calculate the theoretical yield in grams of the precipitate formed. 3. If the actual yield of the experiment was 90.5 mg, what is the % yield of Ag3PO4
What is the rate constant of a first-order reaction that takes 288 seconds for the reactant concentration to drop to half of its initial value?
Determine the number of moles of oxygen that would be needed to completely combust 0.0350 moles of benzene
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