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All living things contain carbon. Most of this carbon is stable carbon-12. However, a small percentage will be carbon-14, a radioactive isotope of carbon that decays with time. As living things eat and breath, carbon is constantly recycled and therefore the percentage of carbon-14 remains constant. It's not until death that the percentage of carbon-14 will begin to diminish from decay. Because radioactive decay is a first-order process, the integrated rate law for a first-order reaction can be rewritten as {\rm fraction~remaining} = 0.5^{(t / t_{1/2})} where t is the time elapsed and t_1/2 is the half-life. The half-life of C-14 is 5730 years. A fossil was analyzed and determined to have a carbon-14 level that is 67.0\% that of living organisms. How old is the fossil? Express your answer with the appropriate units
suppose you wanted to dissolve 106g of na2co3 in enough h2o to make 6.00 l of solution.a. what is the molar mass of
(1) write the electron configuration of Co (III) (2) what is the geometry structure of this complex ion? Linear, Tetrahedral, Square planar or Octahedral. (3) predict the number of unpaired electrons in [Co(en) ] (4) draw the crystal field diagram..
how would you make a 500 ml solution that is 10mM Tris, 2mM EDTA. The formula of Tris is 121.1, EDTA's FW is 187
Calculate the number of grams of sulfuric acid in 0.520 of battery acid if the solution has a density of 1.35 and is 37.4 sulfuric acid by mass.
The combustion of 135mg of a hydrocarbon produces 440mg of CO2 and 135mg of of H2O. The molar mass of the hydrocarbon is 270 g/mol. Determine the molecular formula of this compound ?
when 64.5 g of hcl are allowed to react with 17.6 g of o2 50.4 g of cl2 are collected. determine the limiting reactant
a 21.496 g sample of magnesium is burned in air to form magnesium oxide and magnesium nitride. when the products are
Use your experimentally determined value of ksp and show,by calculations, that Ag2CrO4 should precipitate when 5mL of 0.004M AgNO3 are added to 5mL of 0.0024 M K2CrO4.
Concentrated HCl is 36.5% HCl by mass and has a density of 1.18 g/mL.What is the molality?What is the molarity?
From the following Information, calculate the standard change of enthalpy for the combustion of coal. Compound DeltaHf (kj/mol)
a solution of ethanol c2h5oh in water is prepared by dissolving 77.0 ml of ethanol density 0.79 gcm3 in enough water
Which metal is associated with the synthesis of cyclopropanes?
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