1. pretend that a store has a huge jar of pennies that weighs exactly 25 kg (25,000 g). the person who comes
closest to guessing how many pennies are in the jar wins it.
if the actual abundance of pre-1982 and post-1982 pennies in circulation is the same as the numbers
from your sample, how many "atoms” of pennium (pennies) should there be in 25,000 g jar of
pennies. show your work!
2. you have been given a new sample of the element 'pennium' (pn), and you know that this sample has 55
atoms in it and that the total mass of the sample is 155.5g. you also know that there are two isotopes of
pennium, pennium-2.5 and pennium-3.1. it is your job to figure out how many atoms (of the 55 in your
sample) are of the isotope 2.5 and how many are of the isotope 3.1.