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1 mole just means 6.022 * 10^23 number of things. It is just like how you would say I have a dozen eggs, where dozen refers to "12". You can have 1 mole of atoms, 1 mole of eggs, or in this case, 1 mole of humans. For this question, to find how many moles of humans there are on Earth, simply divide 7.0 billion by 6.022 * 10^23 and you get 1.2 * 10^-14 moles of humans.
I think what this question is getting at is just how large the unit of a "mole" is. Even though it seems strange to think that the world does not even have close to one mole of people, this unit is useful when used in the context of atoms, as a mole of atoms can be held in your hand. Since Avogadro's number is so large, it is a useful unit in quantifying very small particles, such as atoms and molecules.
Micah3J wrote:Why is Avogradro's number based on Carbon 12?
Chemists chose to use Carbon 12 because Carbon 12 has 6 protons, 6 neutrons, and 6 electrons.This is interesting because the mass of an electron is about 1/12th the mass of Carbon 12. Chemists also found that when you have Avogadro's number of Carbon 12, you will have exactly 12grams worth of Carbon 12.
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