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mars1129 [50]
2 years ago
15

What is the "average atomic mass" of this set of pennies.

Chemistry
1 answer:
natulia [17]2 years ago
7 0

Answer:

A. 2.74g is the correct answer

Explanation:

<h3>Greetings!</h3>

average \: mass =  \frac{(mass \: pre - 1982 \times abundance) + (mass \: post - 1982 \times abundance}{100 }  \\ ave = \frac{ (3.1g \times 40.0) + (2.5g \times 60.0)}{100}  \\ ave =  \frac{124 + 150}{100}  \\ ave =  \frac{274}{10}  = 2.74g

where, the sum of abundance always have to be 100%

Thus, 40.0 +60.0= 100.0

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Hello there!

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