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A geological sample is found to have a Pb-206/U-238 mass ratio of 0.337/1.00. Assuming there was no Pb-206 present when the sample was formed, how old is it? The half-life of U-238 is 4.5 × 109 years. Answer 7.1 × 109 years 7.3 × 1011 years 2.1 × 109 years 1.4 × 1010 years 2.4 × 1010 years
a running track measures 1056 ft per lap. to run 15.0 km how many laps should you run? How do you break the equation down into a solution map?
Compute the number of electrons in a flake of pure gold valued at $0.32. Assume that the price of gold is $1219.0/troy oz.
A solution is prepared by dissolving 19.9 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 15.00 mL sample of this stock solution is added to 59.00 mL of water.
If the sample contains a combined total of 1.75 grams per mole and has a total mass of 51.0 grams, what are the percentages of CO2 and Ne in the sample by mole?
calculate the specific heat of a metallic element if 478 j of energy are needed to raise the temp. of a 82.73 g sample
one can safely assume that the 3s- and 3p-orbitals will form molecular orbitals similar to those formed when 2s- and
When Heated, KClO3 decomposes into KCl and O2. 2KClO3 arrow 2KCl+3O2 If this reaction produced 25.8 g of KCl, how much O2 was produced (in grams)
what weigh tof CaCO3 is required to completely react 135 ml of a 0.665M solution. Must show set up.
A solution contains 0.000750 M La^+3 and 0.00385 M Ba^+2. Sodium iodate (NaIo3) is added to from precipitate. Which metal will begin to precipitate out first
write up the chemical reaction between resorcinol and phtalic anhydride.
Describe: a) its use in medical treatment, b) list a common over the counter medicine that once contained this compound and c) why phenolphthalein is being phased out in over the counter medicine formulations
a 3.00 l helium balloon initially at stp floats up to an altitude of 10 km where the pressure is 200.0 torr and the
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