Chemistry

posted by .

A reaction is first order and it takes 324 minutes for the reaction to be 50.0% complete. How long will it take for the reaction to be 85.0% complete at the same temperature?

2. N2O5 decomposes to N2O4 and O2 and the reaction is first order in N2O5 with a specific rate constant of 6.22 x 10^ -4 sec^-1 at 45 C. What will be the initial rate of formation of oxygen if the concentration of N2O5 is 0.100 M?

  • Chemistry -

    1. k = 0.693/t1/2
    solve for k and substitute into the following:
    ln(No/N) = kt
    I would use No = 100 (just an arbitrary number), then N would be 15 left if it was 85% complete. Solve for t.

  • Chemistry -

    Thank you so much. That makes more sense. I had in 85, not 15.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    A reaction is 50% complete in 34.0 min. 1.) How long after its start will the reaction be 75% complete if it is first order?
  2. chemistry

    a reaction is first order and it takes 324 minutes for the reaction to be 50% complete. How long will it take for the reaction to be 85% complete at the same temperature?
  3. chemistry

    A reaction is first order and it takes 324 minutes for the reaction to be 50.0% complete. How long will it take for the reaction to be 85.0% complete at the same temperature?
  4. Chemistry

    Your Open Question Show me another » Chemistry help needed... Confused?
  5. Chemistry

    N2O5 dissolved in CCl4 decomposes to give N2O4 and O2. The reaction is first order with a half-life of 1234 seconds. How long will it take, in seconds, for the concentration of N2O5 to fall to 1.1% of its initial value?
  6. chemistry

    N2O5 dissolved in CCl4 decomposes to give N2O4 and O2. The reaction is first order with a half-life of 1234 seconds. How long will it take, in seconds, for the concentration of N2O5 to fall to 1.1% of its initial value?
  7. chemistry

    N2O5 dissolved in CCl4 decomposes to give N2O4 and O2. The reaction is first order with a half-life of 1234 seconds. How long will it take, in seconds, for the concentration of N2O5 to fall to 1.1% of its initial value?
  8. Chemistry

    Half-life N2O5 dissolved in CCl4 decomposes to give N2O4 and O2. The reaction is first order with a half-life of 1234 seconds. How long will it take, in seconds, for the concentration of N2O5 to fall to 1.1% of its initial value?
  9. Chemistry

    Dinitrogen pentoxide, N2O5, decomposes by a first-order reaction. What is the initial rate of decomposition of N2O5 when 3.6 g of N2O5 is confined in a 0.77 L container and heated to 65°C?
  10. Chemistry

    At a given temperature, a first-order reaction has a rate constant of 3.5 ´ 10–3 s–1. How long will it take for the reaction to be 24% complete?

More Similar Questions