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The age of a rock can be estimated by measuring the amount of 40Ar trapped inside. The calculation is based on the fact that 40K decays to 40Ar by a first-order process. It also assumes that none of the 40Ar produced by the reaction has escaped from the rock since it was formed.
40K + e- ----> 40 Ar K = 5.81E-11 year-1
Calculate the half-life of the radioactive decay.
A compound, C5H12O, has an 1H NMR spectrum showing peaks at delta 0.9 (6 H, triplet), 1.5 (4 H, quintet), and 1.9 (1 H, singlet), and 3.4 (1 H, multiplet).Draw this molecule.
A mammoth skeleton has a carbon-14 decay rate of 0.46 disintegratioins per minute per gram of carbon (0.46 dis/min*g C)
What is the empirical formula of a compound that contains 49.4% K, 20.3% S, and 30.3% O by mass
The molecular orbital diagram CO in the course notes also applies to the following species
Fluorine 18, which has a half live of 110 min, is used in PET scans. If 100 mg of fluorine 18 is shipped at 8am, how many mg of the radioisotope are still active if the sample arrives at 130 pm
For the equilibrium H2+CO2-> Kc= 3.18 at 1106K. If each of the 4 species was initially present at a concentration of 3.000M.
what is the boiling point of a solution of 8.69 g of the electrolyte sodium acetate nach3coo dissolved in 15.00 g of
SnI4 is soluble in acetone. What does this tell you about the ionic nature of this compound? Is the charge on the tin is actually +4? What was the effect of adding KI to the acetone solution?
A 40.0 mg sample of a protein is dissolved in water to make 25.0 mL of solution. The osmotic pressure of the solution is 0.56 torr at 25°C. What is the molar mass of the protein?
Research information about the human olfactory system and olfactory receptors. Explain how humans sense odor and clearly identify how different molecular structures influence the odors we can detect. Properly cite your reference source(s) for this..
You are planning to use the technique of recrystallization to purify A and realize that you will first need to determine which solvent or solvent pair would be appropriate. Describe the solubility properties of the solvent that you would want to u..
Suppose you are given 150 mg of an unknown mixture that contains three compounds, and you are told to separate the compounds using column chromatography, using alumina as a stationary phase. How would you decide what solvent or solvent system to u..
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