There were 4 pre-1982 pennies and 6 post- 1982 pennies.
There are three naturally occurring isotopes of Magnesium: Mg-24 (23.98 amu) found in 78.70% abundance, Mg-25 (24.99amu) found in 10.13% abundance, and Mg-26 (25.98 amu) found in 11.17% abundance. Calculate average atomic mass: The average atomic mass of Magnesium is 24.31amu.
The average atomic mass of Boron is 10.81 amu. The naturally occurring isotopes of Boron are B-10(10.01 amu) and B-11 (11.01 amu). Calculate percent abundance of isotopes.
Boron-10 is found in 20% abundance and Boron-11 is found in 80% abundance.
What is meant by the statement that pennies are “quantized”?
A quantized value is a number that must be restricted when rounding up or down to a limited number of figures. Pennies are always whole entities, you cannot have ½ a penny, so the calculations in this lab are rounded to the whole place.
Conclusion
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In this lab, the manipulation of the average atomic mass equation can solve for the average atomic mass, or in this case, the abundance of the isotope. In the beginning of the lab, we were expected to mass the envelope and subtract the mass of the envelope with the total mass to isolate the mass of the pennies. After applying the quantitative data collected into the equation, the information already given (the mass of the isotopes) was plugged in to solve for 2 variables: the abundance of each pre- and post- 1982 penny. With 2 equations, 2 equations are needed to solve. An equation can be formulated that X and Y add to 100% because their abundance in nature should be