15. Chemical Kinetics

Decomposition of a certain substance Y at 45°C was found to be zero order. What is the half-life of substance Y if it took 15.5 minutes to decompose 67% of this substance? [Y]₀ = 0.25 M.

Radioactive plutonium-239 (t_1/2 = 2.41 × 10⁵ yr) is used in nuclear reactors and atomic bombs. If there are 5.70 × 10² g of plutonium isotope in a small atomic bomb, how long will it take for the substance to decay to 3.00 × 10² g?

Use the data below to determine the half-life of decomposition of NOCl reaction which follows 2nd order kinetics.

How long will it take for the concentration of SO₂Cl₂ to decrease to 25% of its initial concentration?"

What is the rate constant of a first-order reaction when 20.0% of a reactant remains after 30.0 s?

What is the half-life for a particular reaction if the rate law is rate = (1301 min^-1)[A]?

Which of the following statements is False?

Urea (NH2CONH2) is the end product in protein metabolism in animals. The decomposition of urea in 0.1 M HCl occurs according to the reaction

NH2CONH2(𝑎𝑞)+H+(𝑎𝑞)+2 H2O(𝑙)⟶2 NH4+(𝑎𝑞)+HCO3−(𝑎𝑞)

The reaction is first order in urea and first order overall. When [NH2CONH2]=0.200 𝑀, the rate at 61.05°C is 8.56×10−5 𝑀/s.

a. What is the rate constant, k?

b. What is the concentration of urea in this solution after

c. 4.00×103 s if the starting concentration is 0.500 M?

d. What is the half-life for this reaction at 61.05°C?