If a sample of C-14 initially contains 1.7 mmol of C-14, how many millimoles will be left after 2260 years?
The half-life for the radioactive decay of C-14C-14 is 5730 years. |
Part A Part complete How long will it take for 25% of the C-14C-14 atoms in a sample of C-14C-14 to decay? Express your answer using two significant figures. View Available Hint(s)
SubmitPrevious Answers Correct First, the rate (or decay) constant, kk, for the first-order radioactive decay should be determined from the relation between first-order half-life, t1/2t1/2, and the rate constant: k=0.693t1/2=0.6935730years=0.000121years−1k=0.693t1/2=0.6935730years=0.000121years−1 The rate constant can now be used in the first-order integrated rate law to find the time required, tt: ln[A]t[A]0=−ktln[A]t[A]0=−kt where the ratio [A]t/[A]0[A]t/[A]0 can be considered the fraction of C-14C-14 atoms remaining at time tt. Since 25 %% of the C-14C-14 has decayed, 100%−%− 25 %% remains. Rearranging to solve for tt and inserting the values gives t=ln[A]t[A]0−k=ln0.75−1.21×10−4years−1 |
If a sample of C-14 initially contains 1.7 mmol of C-14, how many millimoles will be...
If a sample of C-14 initially contains 1.4 mmol of C-14, how many millimoles will be left after 2275 years? Express your answer in millimoles using two significant figures. Note: The half-life for the radioactive decay of C-14 is 5730 years.
If a sample of C-14 initially contains 1.7 mmol of C-14, how many millimoles will be left after 2260 years?
The half-life for the radioactive decay of C−14 is 5730 years. A) How long will it take for 30% of the C−14 atoms in a sample of C−14 to decay? B) If a sample of C−14 initially contains 1.9 mmol of C−14, how many millimoles will be left after 2280 years?
The half-life for the radioactive decay of C-14 is 5730 years. If a sample of C-14 initially contains 1.6 mmol of C-14, how many millimoles will be left after 2250 years?
The half-life for the radioactive decay of C−14 is 5730 years. If a sample of C−14 initially contains 1.7 mmol of C−14, how many millimoles will be left after 2250 years? Express your answer using two significant figures.
The half-life for the radioactive decay of C-14 is 5730 years. You may want to reference (Pages 598 - 605) Section 14.5 while completing this problem. Exercise 14.58 - Enhanced with Feedback 26 of 48 Review I Constants I Periodic Table The half-life for the radioactive decay of C-14 is 5730 years Part A You may want to reference (Pages 598 605) Section 14.5 while completing this problem. How long will it take for 30% of the C-14 atoms in...
The half-life for the radioactive decay of C-14 is 5730 years. How long will it take for 25% of the C-14 atoms in a sample of C-14 to decay. If a sample of C-14 initially contains 1.5 mmol of C-14, how many mmols will be left after 2255 years.
Help please Review | Constants Periodic Table The half-life for the radioactive decay of C-14 is 5730 years. Part A How long will it take for 20% of the C-14 atoms in a sample of C-14 to decay? You may want to reference (Pages 635 - 641) Section 14.4 while completing this problem. Express your answer using two significant figures. ΥΠ ΑΣφ years Request Answer Submit Part B If a sample of C-14 initially contains 1.1 mmol of C-14, how...
The following questions pertain to radioactive decay, which are first-order reactions. • Decay constant = rate constant • Activity is the number of nuclei (N) decaying per unit time 1. a. What is the decay constant for the B emission of 3H given ty = 12.26 yr? b. What fraction of tritium atoms in a sample remains after 100.0 yr? c. If the original number of tritium atoms was 1.50 x 1018, what is the number remaining? and that a....
I have a test tomorrow and really need help seeing how to do numbers 1,2,3 and 4. If you can start with telling me what equation to use, then solving using that equation, it would be much appreciated. facweb.bhc.edu Practice Kinetics Solve the following use appropriate units and sig figs. QUESTIONS Half lives and rate constants 1. Calculate the first-order rate constant for the radioactive decay of radium. The 1590 years. 2. Calculate the rate constant for the decay of...