Cerium Has Four Stable Isotopes Listed Below

question 74

Multiple Choice

Cerium has four stable isotopes listed below. If the weighted average atomic mass of cerium is 140.116 u, calculate the atomic mass of cerium-142.
Ce-136 135.90714 u 0.19%
Ce-138 137.90599 u 0.25%
Ce-140 139.90543 u 88.43%
Ce-142 11.13%

• A) 141.911 u
• B) 142.617 u
• C) 140.334 u
• D) 142.501 u
• E) 139.886 u

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