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A sample of unknown element X contains the following isotopes: 80% of C -64, 15% of X - 65, and 5% of X-66. What is the average atomic mass of element X? Can somebody help me with this question. Will mark brainliest.

A sample of unknown element X contains the following isotopes 80 of C 64 15 of X 65 and 5 of X66 What is the average atomic mass of element X Can somebody help class=

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arslanamir186

Answer:

64.25

Explanation:

Average atomic mass = percentage × mass of all isotopes/ 100

Relative atomic mass = 80*64+15*65+5*66/100

=5120+975+330/100

=6425/100

64.25

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