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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.
Find the enthalpy delta H of the formation of liquid water in the standard state. g) Find the value U of the molar internal energy of water at standard conditions.
Consider two DNA molecules: one 400 base pairs long, the other 800 base pairs long. Assuming that each is a rigid rod of diameter 25 Å, with a length of 3.4 Å per base pai.
Calculate the wavelength of a neutron that has a velocity of 250 cm/s.
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if 10.7 ml of a 0110 m naoh is required to reach the first equivalence point of a solution of citric acid how many ml
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How much heat is needed to vaporize 3.63 g of liquid oxygen if the molar heat of vaporization for oxygen is 1,629 cal/mole?
Isopropyl alcohol is mixed with water to produce a 31.0% (v/v) alcohol solution. How many milliliters of each component are present
Identify an alkane with the molecular formula c5h12 that forms only one monochlorinated product when heated with Cl2
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