Two gases X and Y are found in the atmosphere in only trace amounts because they decompose quickly. When exposed to ultraviolet light the half-life of X is 105. min, while that of Y is 1.25 h. Suppose an atmospheric scientist studying these decompositions fills a transparent 20.0 L flask with X and Y and exposes the flask to UV light. Initially, the partial pressure of X is 5.0 times greater than the partial pressure of Y. As both gases decompose, will the partial pressure of X ever fall below the partial pressure of Y? If you said yes, calculate the time it takes the partial pressure of X to fall below the partial pressure of Y. Round your answer to 2 significant digits. O yes O no min x10 X 010 S 0 C.

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)?

Phosphorous-32 (black dot) decays by beta emission to form sulfur-32(white dot). How many half-lives have passed in the reaction shown?       Need more information to determine     1     4     3     2

Please solve

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

Consider the radioisotope ⁴¹Ca (half life = 1.03 × 10⁵ years). What is the first-order rate constant for ⁴¹Ca?

Radioactive Decay is a first order process. In 1911 , maria curie prepared a n international radioactivity standard that conatined 22.00 mg of 226 Ra, which has a half life of 1620 years. How much Ra remained in 1977?

Tramadol is a synthetic opioid drug that acts on the central nervous system to relieve moderate to severe pain in adults. Its half-life in the blood stream is 5.5 hours. How long will it take for Tramadol to decay to 20% of the original dosage?

5. A reaction has the expeimental rate law = rate = k[A]2[B]. If the concentraion of A is doubled and the concentration of B is halved, what happens to the reaction rate? 11. Studies of radioactive decay of nuclei show that the decay rate of the radioactive sample is proportional to the amount of the radioactive species present. Once half the radioactivity has disappeared, the radioactive decay rate is only half of its original value. Is radioactive decay a zeroth-order, first order, or second order process? 13. Which of these reactions are unimolecular and elementary, which are bimolecular and elementary, and which are not elementary? a. HCl(g) + H2O(g) -----> H3O+(g) + Cl-(g) b. I- (g) + CH3Cl(g) ----> ICH3(g) + Cl-(g) c. C2H6 (g) -----> C2H4(g) + H2(g) d. N2(g) = 3 H2(g) ---> 2 NH3 (g) e. O2(g) = O(g) ---> O3(g)   15. The activation energy Ea is 139.7 kJ mol-1 for the gas pahse reaction HI + CH3I ----> CH4 + I2 Calculate the fraction of the molecules whose…

Radioactive materials are often used in biological studies. A radiation biologist studies the rate of decomposition of a certain substance and obtains the following data: Time (days) 0 4.0 8.0 12.0 16.0 Mass (μg) 26.20 18.13 12.55 8.69 6.01 How many micrograms will remain after 26 days?