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Naturally occurring cobalt consists of only one isotope, ^59Co, whose relative atomic mass is 58.9332. A synthetic radioactive isotope of cobalt, ^60Co, relative atomic mass 59.9338, is used in radiation therapy for cancer. A 1.7801 g sample of cobalt has an apparent "atomic mass" of 58.9901. Find the mass of ^60Co in this example.
calculate the equilibrium constant K at 25 degrees for the reaction Fe+Cd2+9aq) ---> Fe2+(aq) +Cd(s) where E cell = 0
Express you answer as a chemical equation. Identify all of the phases in your answer.
Describe how you would prepare each of the following aqueous solutions. - 230 g of a solution that is 0.60 molal in Na2CO3 starting with the solid solute.
How many molecules of NO2 are produced when 5.38 mol of ammonia is completely reacted?
magnesium oxide decomposes into magnesium and oxygen. if 12.09 of magnesium oxide decomposes to form 7.29 of
The mass spectrum of an organic compound shows the relative abundances of M to be 34.83% and M 1 to be 6.027%. Assuming the peaks are caused by 12C and 13C isotopes
a)is the half reaction an oxidation or reduction b)what substance is oxidized or reduced c)at which electrode would this half reaction occur
determine that how many moles of molecular hydrogen are used per mole of the precatalyst in order to convert it
Partial pressure of argon = ( ? )atm. Now suppose that 7.00 moles of xenon are added to the vessel without changing the volume or temperature. What is the partial pressure of argon now
When optically active propylene oxide is used, the 1,2-diol obtained from the acid hydrolysis has a optical rotation opposite from the Alkaline hydrolysis. Write the mechanism of each hydrolysis that is likely to explain these facts.
Calculate the percent water: mass of water lost / mass of hydrated salt x 100%. E. Write the empirical formula for hydrated alum, based on your experiment.
Which of the following expressions is not equivalent to pH? a. log 1/[H+(aq)] b. 14.0-pOH c. -log [H+(aq)] d. -log Kw/[OH-] e
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