Concept explainers
Interpretation:
Chromium’s
Concept introduction:
Atomic mass of an element is the weighted average mass of the
Answer to Problem 78A
Atomic mass of chromium is 51.996 amu.
Explanation of Solution
Isotope | Percent Abundance | Mass (amu) |
Cr50 | 4.35 | 49.946 |
Cr52 | 83.79 | 51.941 |
Cr53 | 9.50 | 52.941 |
Cr54 | 2.36 | 53.939 |
Cr50
Atomic mass − 49.946 amu
Percentage abundance − 4.35%
Cr52
Atomic mass − 51.941 amu
Percentage abundance − 83.79%
Cr53
Atomic mass − 52.941 amu
Percentage abundance −9.50%
Cr54
Atomic mass − 53.939 amu
Percentage abundance − 2.36%
Thus, chromium atomic mass is 51.996 amu.
Chapter 4 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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