You Discover a New Element Which Consists of Two Isotopes

question 88

Multiple Choice

You discover a new element which consists of two isotopes.  The first isotope, ²⁴³X (mass = 242.45 u)   comprises 40.000% of the total.  The second isotope, ²⁴⁸X (mass = 247.11 u) accounts for the rest.  What would be the average atomic mass for your new element?

• A)242.45 u
• B)244.32 u
• C)245.25
• D)247.11

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