Zinc has three major and two minor isotopes. For this problem, assume that the only isotopes of zinc are the major ones, zinc-64, zinc-66, and zinc-68. The atomic mass of zinc-64 is 63.9291 Da, that of zinc-66 is 65.9260 Da, and that of zinc-68 is 67.9248 Da. Calculate the atomic mass of zinc from the relative peak intensities in the following spectrum.

Peaks: At Zn-64=100, Zn-66=57.4, Zn-68=38.6


  1. 👍
  2. 👎
  3. 👁
  1. I would change the intensities to percent.
    100 + 57.4 + 38.6 = 196
    Then 100/196 = about 51% but you need to do these more accurately.
    57.4/196 = about 29%
    38.6/196 = about 19%

    (0.51)(mass Zn64) + (0.29)(mass Zn66) + (0.19)(mass Zn68) = Avg mass Zn. I obtained 65.294 but you need another place.

    1. 👍
    2. 👎
  2. Great Answer

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    iridium has two isotopes. with mass numbers 191 and 193, and its average relative atomic mass is 192.23.calculate the relative abundances of the two isotopes

  2. chemistry

    Copper used in electric wires comes in two flavors (isotopes): 63Cu and 65Cu. 63Cu has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, 65Cu, has an abundance of 30.91%. The average atomic mass between

  3. chemistry

    Gallium is a metal with a wide variety of uses. Some of its applications include computer memory chips, light emitting diodes and lasers. Radioactive isotopes of gallium are used to image the human body and locate tumors.

  4. Science Help!

    Atomic theory is A. Subject to change if new information is discovered B. A solution to the problem of differing isotopes C. Unchangeable D. A descriptive table that lists all of the elements Is the answer A? Thank you

  1. Chemistry

    Copper is composed of two naturally occurring isotopes: Cu−63 (69.170%) and Cu−65. The ratio of the masses of the two isotopes is 1.0318.

  2. Algebra

    Two different radioactive isotopes decay to 10% of their respective original amounts. Isotope A does this is 33 days, while isotope B does this in 43 days. What is the approximate difference in the half-lives of the isotopes? 3

  3. Chemistry

    Which of the following are key parts of Dalton's Atomic Theory (Click the 4 that apply)? (1 point) All elements are composed of tiny indivisible particles called atoms*** Atoms of the same element are identical. The atoms of any

  4. Organic Chemsitry

    By knowing the natural abundance of minor isotopes, it's possible to calculate the relative heights of M+ and M+1 peaks. If natural abundances are 12C - 98.9% and 13C - 1.10%, what are the relative heights, to the nearest 0.1%, of

  1. Chemistry

    Which element has no stable isotopes? 1. (subscript)27 Co 2. (subscript)51 Sb 3. (subscript)90 Th 4. (subscript)82 Pb I believe it's either 2 or 3, but I can't decide which. I'm not sure how to go about answering this question,

  2. Science/Math

    Hello, Suppose that a newly discovered element called centium has three isotopes that occur in nature. These are centium-200, centium-203, and centium-209. Assume that these isotopes occur in equal amounts in nature. What will be

  3. Chemistry

    This Chem problem is really difficult -Need help please! Magnesium Consists of three naturally occuring isotopes. The percent abundance of these isotopes is as follows: 24Mg(78.70%), 25Mg(10.13%) and 26Mg(11.7%). The average

  4. chemistry

    magnesium has 3 isotopes. Magnesium-24 has a percent abundance of 78.99%. Magnesium-26 has a percent of 11.01%. what is the percent abundance of magnesium-25? assume that there are no other magnesium isotopes. how do i do this

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