Explore BrainMass

Explore BrainMass

    Original Sample of Nuclides

    Not what you're looking for? Search our solutions OR ask your own Custom question.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    Please see the attachment for the questions, which are chemistry questions related to finding a compound's half-life, balancing equations, etc. Please show the steps involved with solving these problems.

    © BrainMass Inc. brainmass.com December 24, 2021, 10:56 pm ad1c9bdddf
    https://brainmass.com/chemistry/general-chemistry/original-sample-nuclides-520195

    Attachments

    SOLUTION This solution is FREE courtesy of BrainMass!

    Please find answers to your questions attached. Please confirm if the isotope of Calcium in question 12 is Ca-45. If so, then the calculated value agrees with the literature value.

    11. The equation for radioactive decay is NT = N0 × e−kt
    Where NT is the Amount remaining after a time t (minutes) and k is the radioactive decay constant
    Taking the logarithm of both sides with respect to e, you can rewrite the equation as
    ln (N_32/N_0) = k×T1/2
    and from which we get ln (0.5) = k × 32.....................................................(1)
    since 32 minutes is the half-life
    Then we also have ln (N_180/N_0) = k×180....................................................(2)
    Where we need to find N_180/N_0 where N180 refers to the amount left after 180 minutes or 3 hours.
    Dividing (2) by (1) we get ln ln (N_180/N_0) = 180 × 32 × (ln 5) = -3.899
    Which gives (N_180/N_0) = 0.02026
    OR only 2.03% of the original amount is left after 180 min or 3 hours.

    12. Using the same equation for radioactive decay
    ln (N_t/N_0) = −k×t
    where k is the decay constant and t is the time
    For the half-life, N_t/N_0 = 0.5 and k = 4.23 × 10−3 day−1
    And t1/2 = ln 0.5/4.23 × 10−3 day−1 = 163.86 days for the 45-Ca isotope.

    13. PCl3 + 3H2O → H3PO3 + 3HCl

    14. P4O10 + 6H2O → 4H3PO4

    15.
    [Co(NH3)4Cl2]Br
    Tetraamminedichlorocobalt(III) bromide

    16. Coordination of Cobalt(III) = 6

    17. Coordination Geometry = Octahedral, or more correctly, distorted Octahedral.

    18. Geometrical iosmerism may be exhibited by this complex—the two Cl ligands may be trans (opposite) to each other OR the two Cl ligands may be cis to each other (adjacent)

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 10:56 pm ad1c9bdddf>
    https://brainmass.com/chemistry/general-chemistry/original-sample-nuclides-520195

    ADVERTISEMENT