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Author Question: Nickel has a lower atomic mass than cobalt, even though it has a higher atomic number. One possible ... (Read 45 times)

jlbond23

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on: Nov 5, 2023

Question 1

Hydrogen gas is reacted with nitrogen gas to form ammonia gas. Write the balanced reaction (omit state symbols (s), (l), (g), (aq), etc.).

Question 2

Nickel has a lower atomic mass than cobalt, even though it has a higher atomic number. One possible explanation is that one of the average atomic masses was miscalculated. In the case of cobalt, there is only one isotope: 100% 59Co at a mass of 58.9332 amu. For nickel, however, there are five isotopes as given in the table.
Isotope
mass (amu)
abundance
   58Ni
  57.9354
  67.76%
   60Ni
  59.9308
  26.16%
   61Ni
  60.9311
    1.25%
   62Ni
  61.9283
    3.66%
   64Ni
  63.9280
    1.16%
         
A. Using the data in the table, calculate the average atomic mass for nickel.
         
B. Is the atomic mass for nickel in your periodic table correct?
         
C. Regardless of your answer to part B, how else could you explain the observation that the atomic mass of nickel is less than the mass of cobalt, even though it has the higher atomic number?
Chemistry ¦ Chang, Goldsby ¦ 11th Edition
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Marked as best answer by jlbond23 on Nov 5, 2023

romyclv

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Reply #1 on: Nov 5, 2023
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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jlbond23

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Reply 2 on: Nov 5, 2023
Gracias!

31809pancho

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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