Question

30.The carbon−14 decay rate of a sample obtained from a young tree is 0.490 disintegration per second per gram of the sample. Another wood sample prepared from an object recovered at an archaeological excavation gives a decay rate of 0.182 disintegration per second per gram of the sample. What is the age of the object? Hint: The rate constant for carbon−14 decomposition is 1.21 × 10−4 yr−1. Report your answer to 3 significant figures. in scientific notation

31.Consider the following elementary step X + 2Y → XY2 If the initial rate of formation of XY2 is 0.0057 M/s and the initial concentrations of X and Y are 0.27 M and 0.62 M, what is the rate constant for the reaction?

Answer 1