chemistry

If the half-life of a first-order decomposition reaction is 24.2 minutes, how long will it take for 10.0 moles of the reactant to decompose so that only 2.5 mol remains?

  1. 👍
  2. 👎
  3. 👁
  1. k = 0.693/t1/2
    ln(No/N) = kt
    No = 10.0
    N = 2.50
    K from above.
    Solve for t in minutes.

    1. 👍
    2. 👎
  2. test

    1. 👍
    2. 👎
  3. ettgd

    1. 👍
    2. 👎
  4. 36.3

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chem Class

    The rate constant of a first-order process that has a half-life of 225 s is ?????? s-1. ok so i divided half life of 1st order= 0.693/K k i put 225 and i got 3.08 x 10^-3 is that right?

  2. Chemistry

    Gallium65, a radioactive isotope of gallium, decays by first order-kinetics. The half-life of this isotope is 15.2 min. How long would it take for 7/8 of a sample of this isotope to decay? 15.2 min 30.4 min 45.6 min 48.0 min I'm

  3. chemistry

    The half-life for the first-order decomposition of is 1.3*10^-5. N2O4--> 2NO2 If N2O4 is introduced into an evacuated flask at a pressure of 17.0 mmHg , how many seconds are required for the pressure of NO2 to reach 1.4mmHg ? i

  4. Chemistry

    A reaction is first order in A. If the rate constant of the reaction is 3.45x10^-3 s-1, what is the half life of the reaction? a. 4.98x10^-3 s b. 200 s c. 3.45x10^-3 s d. 100 s e. 1.73x10^-3 s

  1. chemistry

    If there are 80 milligrams of a radioactive element decays to 10 milligrams in 30 minutes then what is the elements half life in minutes? Ok i narrowed it down to either 10 or 30...but im rly confused so if u could help it wuld be

  2. Chem

    An electrochemical cell based on the decomposition of H2O2 can be constructed based on the half-reactions in the table below. Half-Reaction | Standard Reduction Potential, E° H2O2+ 2e- => 2 OH- | 0.88 V O2+ 2 H2O + 2e- => H2O + 2

  3. Chemistry

    The rate constant for a second-order reaction is 0.54 M-1s-1. What is the half-life of this reaction if the initial concentration is 0.27 M

  4. Chemistry

    For the reaction 2 NO (g) + Cl2 (g) → 2 NOCl (g) If the concentration of NO is tripled, the rate of the reaction increases by a factor of nine. If the concentration of Cl2 is cut in half, the rate of the reaction is decreased to

  1. Chemistry

    Dinitrogen pentoxide, N2O5, decomposes by first-order kinetics with a rate constant of 0.15 s-1 at 353 K. (a) What is the half-life (in seconds) for the decomposition of N2O5 at 353 K? (b) If [N2O5]0 = 0.0579 mol·L-1, what will

  2. Chemistry

    The decomposition of a certain element was observed over a period of 30 hours and the results were recorded in the table below. What is the order for the reaction and what is the half life for the decomposition? Time (hrs), %

  3. Math help

    Gold (Au) has a synthetic isotope that is relatively unstable. After 25.5 minutes, a 128-gram sample has decayed to 2 g. What is the half-life of this isotope? 8.5 minutes 2.25 minutes 1.5 minutes 4.25 minutes

  4. Chemistry

    The decomposition of hydrogen peroxide is first order in H2O2: 2H2O2(aq) → 2H2O(l) + O2(g) Rate = k [H2O2] How long will it take for half of the H2O2 in a 10-gal sample to be consumed if the rate constant for this reaction is

You can view more similar questions or ask a new question.