An archaeologist finds some ancient jewelry made from bone. the jewelry has a carbon mass of 127 g (hint: assume all the carbon is 12c and determine the number of atoms) and careful measurements show that the remaining 14c has a current decay rate of 21 decays/s. determine the age of the bone (and presumably the jewelry). remember, the ratio of 14c to 12c when the animal died was 1.3×10-12 & the half-life of 14c is 5730 y.

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In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.