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.) (77.988 9221H/28:98 x-0470)(X

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.) (77.988 9221H/28:98 x-0470)(X

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

Can you give me explanations and only last two question

(23.985 X 787) + (24.986 X-1013)+(25.983 X-117)
79.90
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
(23985 x 78)+(24 986 X-1013)+(25.983 X-1)
24.31u
300
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.)
(27.98x.9221)+28.98x.0470)(X
1.36
9.53x =2&09
25-80
9.531
2716
%3D
a.53
-27.16
- 2१-16
2 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.
14
PC 96-1 FC
t.

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