chemistry

caffeine has a half-life of 4.6 hours in the human body.. How long would it take 125 milligrams tritium to decay to 22 milligrams?

  1. 👍
  2. 👎
  3. 👁
  1. Pray tell what does caffeine have to do with tritium?
    For tritium,
    k = 0.693/t1/2
    You will need to look up the half-life of tritium unless that is the "caffeine" half-life.
    Substitute k into the below equation.
    ln(No/N) = kt
    Nl = 125
    N = 22
    k = from above calculation.
    t = time. Solve for this. Note that the unit for time and the unit for half-life must be the same.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    Technetium-99m, an important radionuclide in medicine, has a half-life of 6.0 hours. What percentage of a sample of technetium-99m will remain undecayed after the following times? 18.0 hours 1 day 5 half- lives

  2. Chemistry

    Suppose a patient is given 140mg of I−131, a beta emitter with a half-life of 8.0 days. Assuming that none of the I−131 is eliminated from the person's body in the first 4.0 hours of treatment, what is the exposure (in Ci)

  3. Science

    An element has a half-life of 29 hours. If 100 mg of the element decays over a period of 58 hours, how many mg of the element will remain? So far I have; n= elapsed time/ half-life =58/29 n=2

  4. chemistry

    sodium-24 has a half-life of 15 hours how much of a 20 gram sample would remain after 30 hours? and how do you solve this?

  1. Calculus (math)

    Warfarin is a drug used as an anticoagulant. After administration of the drug is stopped, the quantity remaining in a patient's body decreases at a rate proportional to the quantity remaining. Suppose that the half-life of

  2. Chemistry

    Caffeine a stimulant found in coffee has the mass composition of C, 49.48%, H, 5.19%, N, 28.85%, O 16.48%. The molar mass of caffeine is 194.19g/mol. Find the molecular formula for caffeine.

  3. Pre Calc!

    A drug is eliminated from the body through urine. Suppose that for a dose of 10 milligrams, the amount A(t) remaining in the body t hours later is given by A(t)=10(0.8)^t and that in order for the drug to be effective, at least 2

  4. 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

  1. Probablity

    The life time of a certain kind of batteries has a mean life of 400 hours and standard deviation as 45 hours. Assuming the distribution of life to be normal, find i) the percentage of batteries with a life time of atleast 470

  2. chemistry

    a)indium-115 has a half life of 4.5 hours. if you start with a 12.0-mg sample of indium-115, how much will remain after 13.5 hours? b)how much of a 3.50-mg smaple of nickel-63 will remain after 368 years? the half-life of

  3. Chemistry

    I've figured out most of it. I'm not sure how to find the percentage ofd the isotope. Define the half life. The half-life of a radioisotope is found to be 4.55 minutes. If the decay follows first order kinetics, what percentage of

  4. chemistry

    How many liters of pure oxygen at STP is consumed by a human being in 24 hours if the human body requires daily energy that comes from metabolizing 816 grams of sucrose (C12H22O11)? C12H22O11(s ) + 12 O2(g) => 12 CO2(g)+11 H2O

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