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An unknown element X has the following isotopes: ⁵²X (79.50% abundant), ⁴⁹X (8.00% abundant), ⁵⁰X (12.50% abundant). What is the average atomic mass in amu of X?

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Answer:

51.51 amu .

Explanation:

The atomic mass 52 amu has percentage of 79.5%

The atomic mass 49 amu has percentage of 8%

The atomic mass 50 amu has percentage of 12.5 %

Average atomic pass will be weighted average of their atomic weights

= 52 x .795 + 49 x .08 + 50 x .125

= 41.34 + 3.92 + 6.25

= 51.51 amu .  

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