Author Question: Zinc has five naturally occurring isotopes, Zn-64, Zn-66, Zn-67, Zn-68 and Zn-70. Calculate the ... (Read 68 times)

JGIBBSON · **on:** Nov 18, 2019

Question 1

Carbon has two naturally occurring isotopes, carbon-12 and carbon-13. The more common isotope of carbon is carbon-12 with an abundance of 98.93% while carbon-13 has an atomic mass of 13.00335 u. Calculate the atomic mass of carbon-12 if the atomic mass of carbon is 12.0107 u.
◦ 12.8 u
◦ 12.4 u
◦ 12.0 u
◦ 13.1 u
◦ 13.0 u

Question 2

Zinc has five naturally occurring isotopes, Zn-64, Zn-66, Zn-67, Zn-68 and Zn-70. Calculate the atomic mass of zinc given the following abundances and atomic masses for the isotopes:

Zn-64

63.9291 u

48.61%

Zn-66

65.9260 u

27.9%

Zn-67

66.9271 u

4.1%

Zn-68

67.9248 u

18.75%

Zn-70

69.9253 u

0.62%

◦ 64.8 u
◦ 66.3 u
◦ 65.4 u
◦ 65.1 u
◦ 66.7 u

jsm54321 · **Reply #1 on:** Nov 18, 2019

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