A new element is discovered. It decomposes at rate = k[X]^3 If the half life is 4 hours and the concentration is 16 micromolar, what is the rate constant in 1/M^2*s

Radioactive iodine-131, used in radiotherapy to treat cancer, has a first-order half life of 8.0 days. A sample of iodine-131 is injected directly into a tumor. How long will it take for 15% of the iodine-131 to remain in the tumor? First order: Ln{[A]0/[A]} = kt Half life = 0.693/k

What is the half-life (seconds) of a reaction that has a rate constant, k = 0.00554 M/s where the initial concentration is 0.712 M? Report your answer to the tenths place and do not include units.

What is the overall order of the following reaction, given the rate law? 2 X + 3 Y → 2 Z Rate = k[X]°[Y]1 O 1st order 4th order O 3rd order O 2nd order

Radioactive decay occurs following first order kinetics. If the half-life of a sample of Cl-36 is 3.0 x 105 years, what is the value of the rate constant, k in s-1? t1/2=0.693k

Radioactive decay of 212Bi is observed to be a first-order process with a half-life (t½) of 4.00 days.  It is noted that a 1.70 g sample of 212Bi decays over 12 days to leave only 0.213 g behind.  What is the rate constant (k) for this process?   a. 12.0 day–1   b. 0.250 day–1   c. 0.173 day–1   d. 5.77 day–1   e. none of these

The rate constant for the decay of a radioactive isotope is 4.234 x 10-3/day. What is the half-life of this isotope (in days)?

Write the reaction rate expressions for the reaction below in terms of the disappearance of the reactants and the appearance of products. Give the expressions for the disappearance of the reactants first, in the order written in the chemical equation. Then write the expressions for the appearance of the products in the order written in the chemical equation. Write the expressions in order of appearance in the equation in the form: 1 +* X Δ[Α] At 2H₂(g) + O₂(g) Rate of H₂= Rate of O₂ = Rate of H₂O = 1x X X X where is either a plus OR a minus sign, not both, X is an integer, and A is a chemical species. Do not include the state of matter. 2H₂O(g) A[H₂ At A[0₂] At A[H₂O] At 00 X Ś

In a patient, the fraction of radioactive iodine 131I (Iodine) remaining after 32 days was found to be 1/16. Using this information and your knowledge of the rate law, show that the half-life of radioactive iodine is 8.0 days.

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