Chemistry

posted by .

The standard atom for the atomic masses of all the elements is the atom of carbon which has 6 protons and 6 neutrons (12C) and is assigned the atomic mass of exactly 12. Under this standard, the atomic mass of iron, atomic number 26, is 55.845 u and the atomic mass of gold, atomic number 79, is 196.967 u. If, however, the atom of gold which contains 79 protons and 118 neutrons (197Au) were to be made the standard instead of the atom of 12C, and assigned the atomic mass of exactly 200, what would the atomic mass of iron become?


How would you solve this? Would you set a ratio between Au-197 and the relative atomic mass of Fe or a ration between the relative atomic mass of Au and Fe? If it's the latter why?

  • Chemistry -

    The ratio of Fe to Au, based on C-12=12.00 is 55.845/196.957 = 0.2835390
    and that number x 200 = ?? mass Fe based on Au at 200 instead of 196.957. I have used more significant figures in the ratio above than is justified but you can pare that down with the final answer. Another way to look at it is just as you would do a dimensional analysis problem.
    Fe(@C=12.00) x (Au@200/Au@C=12.00)=
    55.845 x (200/196.957) = ?? Fe @ Au=200
    Check my thinking. Check my arithmetic.

  • Chemistry -

    the answer is 60

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Final Exam- Honors Physical Science

    how can you determine the number of protons, electrons,neutrons, atomic number, and the atomic mass of an element using the periodic table?
  2. physical science

    Thanks got through all but one Element P has an atomic number of 92 and atomic mass of 238. Element s has 92 protons and 143 neutrons. atomic number and protons are the same would htese two elements be an isotope or different elements
  3. Science

    1. Which statement about subatomic particles is NOT true?
  4. chemistry

    I wanted to check my True and False Chemistry HW. I am not 100% they are correct. 1.the number of neutrons in an atom is reffered to as its atomic number False 2.the periodic table is arranged by increasing atomic number True 3.atomic …
  5. chemistry

    1.what is meant by atomic number of an element?
  6. chemistry

    1)nitrogen atom has atomic no 7 and mass no 14.hydrogen atom has atomic no 1 and mass no 1.what is no of protons and neutrons of ammonium ions
  7. Atomic Model/Science

    A particular neutral uranium atom has 92 protons,143 neutrons, and an atomic mass of 235. How many electrons does the atom have?
  8. science

    1.the modern atomic model includes orbiting the nucleus. which of the following parts of dalton's was disproved by the discovery of the electron atoms are tiny particles atoms cannot be divided into smaller parts atoms have specific …
  9. Chemistry

    How is it possible that the atomic number increases in order, yet the atomic masses do not?
  10. science

    1. When Mendeleyev arranged the elements into the periodic table, he found that elements with fell into groups on the table A. the same mass B. similar size C. Similar properties D. The same color 2. Every element has its own atomic …

More Similar Questions