Penny Copper
The comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth ?
The comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth is made to illustrate which of the following?
a. that atoms are indivisible
b. that atoms are very small
c. that atoms are very large
d. that in a copper penny, there is one atom for every person on Earth
a current penny is 2.5 g and is 2.5% Cu by mass.. copper has an atomic mass of 63.5 g/mole…
2.5 g coin x (2.5 g Cu / 100 g coin) x (1 mole Cu / 63.5g Cu) x (6.022×10^23 atoms Cu / mole Cu) = 5.93×10^22 atoms Cu
ie…5.93×10^22 atoms Cu / coin versus 7×10^9 people living on the earth.
so “d” is incorrect.. leaves a,b, and c… a is out… it doesn’t make sense. leaves b and c…
think about it like this….we have this entire planet and there are 7×10^9 people living on it.
a tiny penny has roughly 1×10^16 times as many copper atoms in it as people living on the earth. that’s a million billion x the number of people on the earth. means the atoms are extremely tiny…
answer is b
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