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The activity R of a sample of an unknown radionuclide is measured at hourly intervals. The results, in MBq, are 80.5, 36.2, 16.3, 7.3, and 3.3. Find the half-life of the radionuclide
What is the theoretical yield of benzilic acid in this experiement when 100 mg of benzil is used as the reactant
When the flask is allowed to cool the vapor condenses and aire again refulls the flask. Re weighing the flask and figure out the the wight of the unknown vapor which filled the flask during the boiling. Explain why it is not necessary to know the w..
Lithium iodide has a lattice energy of -7.3 times 10^2 kJmol and a heat of hydration of -793 kj/mol. Find the heat of solution for lithium iodide.
hydrazine n2h4 has pkb16.07 and pkb215.05. draw a structural formula for hydrazine and write the two equations
An acid solution is 5.00% HCl by mass. Assuming that the density of the solution is 1.0 g/mL, find the molarity of the hydrogen ion in the solution. The molar mass of HCl is 36.5 g/mol
Precisely 14.3 mL of water at 30.0 degrees Celsius are additional to a hot iron skillet. All of the water is rehabilitated into steam at 100 degrees Celsius. The mass of the pan is 1.25 kg also the molar heat capacity of iron is 25.19 J/(mol*degre..
A titration was performed at 25 degrees C and the Ksp of a slighlty soluble salt was determined to be 1.5×10-4. Calculate the standard Gibbs Free Energy of this salt. R = 8.314 J/mol-K
Calculate the change in the entropies of the system and the surroundings, and the total change in entropy, when a sample of nitrogen gas of mass 14 g at 298 K and 1.00 bar doubles its volume in a.) an isothermal reversible expansion
if you wish to further purify this liquid after column chromatography what techniques could you use? what would the
what is the change in the boiling point of a solution made by dissolving 14.7 g of c6 h12 o6 into 150.0 ml of water?
If all the chloride in a 5.000g sample of an unknown metal chloride is precipitated as silver chloride with 70.90mL of 0.2010M silver nitrate, explain what is the percentage of chloride in the sample
The Zeeman effect is observed as a splitting in the spectral lines of hydrogen in the presence of a magnetic field. What is the greatest number of lines that a single spectral line can be split into by a magnetic field? a)2 b)3 c)4 d)5 e)6
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