ACTIVITY Finding the Average People Mass

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SN ___ Name _______________________________

Period ______

Date Saturday, April 04, 2015

Finding the Average People Mass for the Element “Humanium”
In this exercise you will find the Average People Mass of your classmates. This number will be entered onto the periodic
table of elements as the mass of the element “Humanium.” There are two isotopes of the element Humanium in the
room: males( )and females (. ). The males will find their average mass and the females will find their average mass,
and the two will be combined to find the APM of the entire species. Your first step will be to record your own weight in
kilograms, or People Mass Units, which is the unit of measure for mass.
Now, find the mass of everyone in the room that is female, and average them out:
Female Subject

Mass (kg)

Total mass of females: ________________

Female Subject

Mass (kg)

Total number of females: ________________

Total mass of people that are female/number of people that are female = average female mass
________________ /________________ = ________________ kg.
Now, find the mass of everyone in the room that is female, and average them out:
Male Subject

Mass (kg)

Male Subject

Mass (kg)

Total mass of males: ________________

Total number of males: ________________

Total mass of people that are male/number of people that are female = avg. male mass
________________ /________________ = ________________ kg.
Next, you will need to find the natural abundance of the two isotopes. This is a measure of how common the isotopes
are; the higher the natural abundance, the more likely you are to encounter this isotope.
How do you find the natural abundance of males or females? It’s easy; just divide the number of males by the total
number of people in your sample, and the number of females by the total number of people in your sample to find the
natural abundance of each. The total number of people in your sample will be the total number of people who added their
mass to the calculations (the number of males + number of females).
Total number of people in your sample (females + males) = ________________
Natural Abundance of Male Isotope = (number of males in room/number of students in room)
Natural Abundance of Male Isotope = (________________ /________________) = ________________
Natural Abundance of Female Isotope = (number of females in room/number of students in room)
Natural Abundance of Female Isotope = (________________ /________________) = ________________
Now that you have the average mass of the males (the male isotope), and the females (the female isotope), and their
natural abundance, you can find the Average People Mass using the following formula:
APM = (mass of male isotope X natural abundance of males) + (mass of female isotope X natural abundance of females)
APM = (________________X ________________) + (________________X ________________)
APM = ________________ People Mass Units
Conclusions:

Humanium

1. How many females matched the average female mass? ___________
a. How many did not? _________
2. How many males matched the average male mass? ___________
a. How many did not? _________
3. How are the masses of the individual students like the masses of individual atoms of an element?

______________________________________________________________________________________________
_______________________________________________________________________________________________
4. In a COMPLETE sentence(s), discuss how this activity relates to average atomic mass and isotopes.
______________________________________________________________________________________________
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