Question

For a particular first-order reaction, it takes 48 minutes for the concentration of the reactant to decrease to 25% of its initial value. What is the value for rate constant (in s^-1) for the reaction?

Select one:

A. 4.8 × 10^-4 s^-1

B. 6.0 × 10^-3 s^-1

C. 1.0 × 10^-4 s^-1

D. 2.9 × 10^-2 s^-1

For the first-order reaction, 2 N₂O(g) → 2 N₂(g) + O₂(g), what is the concentration of N₂O after 3 half-lives if 0.15 mol of N₂O is initially placed into in a 1.00-L reaction vessel?

Select one:

A. 9.4 × 10^-3 M

B. 7.5 × 10^-2 M

C. 3.8 × 10^-2 M

D. 1.9 × 10^-2 M

Which statement below regarding the half-life of a second-order reaction is true?

Select one:

A. The length of the half-life remains unchanged throughout the course of the reaction.

B. Each half-life is half as long as the preceding one.

C. Each half-life is four times as long as the preceding one.

D. Each half-life is twice as long as the preceding one.

Answer 1

Please post the remaining question as a new question