79.40.79.903. Calculate the average atomic mass of magnesium using the following data forthree magnesium isotopes.IsotopeMg-24Mg-25Mg-26% abundance78.710.1311,17mass (u)23.98524.98625.983(23.985 X 787)+(24986 x-1013)+(25.983 X.117)24.31u30-034. Three isotopes of silicon occur in nature: silicon-28 (27.98 amu) is 92.21 %,silicon-29(28.98 amu) is 4.70% and a third isotope. What is the mass of the thirdisotope is the average atomic mass is 28.09 amu? (Hint: Find the percent first.)9.53(27.98x.9221)+28.98x.0470)(X X)= 21.369.53x =2809- 27-1625-809.53X2716-27.16a.535. Calculate the percent abundance of carbon-14 with a mass of 13.97 u and carbon-12 with a mass of 11.93u if the atomic mass is 12.01 u. Assume no other isotopesexist."C 96-1/ +C

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Answered: 5. Calculate the percent abundance of…

5. Calculate the percent abundance of carbon-14 with a mass of 13.97 u and carbon- 12 with a mass of 11.93u if the atomic mass is 12.01 u. Assume no other isotopes exist.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

100%

79.40.
79.90
3. Calculate the average atomic mass of magnesium using the following data for
three magnesium isotopes.
Isotope
Mg-24
Mg-25
Mg-26
% abundance
78.7
10.13
11,17
mass (u)
23.985
24.986
25.983
(23.985 X 787)+(24986 x-1013)+(25.983 X.117)
24.31u
30-03
4. Three isotopes of silicon occur in nature: silicon-28 (27.98 amu) is 92.21 %,
silicon-29(28.98 amu) is 4.70% and a third isotope. What is the mass of the third
isotope is the average atomic mass is 28.09 amu? (Hint: Find the percent first.)
9.53
(27.98x.9221)+28.98x.0470)(X X)= 2
1.36
9.53x =2809
- 27-16
25-80
9.53X
2716
-27.16
a.53
5. Calculate the percent abundance of carbon-14 with a mass of 13.97 u and carbon-
12 with a mass of 11.93u if the atomic mass is 12.01 u. Assume no other isotopes
exist.
"C 96-1/ +C

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