Get expert advice and community support for all your questions on IDNLearn.com. Join our knowledgeable community and get detailed, reliable answers to all your questions.

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

(can you guys also include a formula on how i can solve future problems like this, please.)


What Is The Average Atomic Mass Of This Set Of Pennies Can You Guys Also Include A Formula On How I Can Solve Future Problems Like This Please class=

Sagot :

Answer:

A. 2.74g is the correct answer

Explanation:

Greetings!

[tex]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[/tex]

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

Thus, 40.0 +60.0= 100.0