Avogradro's Number  [ENDORSED]

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Claire Lo 3C
Posts: 55
Joined: Sat Aug 17, 2019 12:18 am

Avogradro's Number

Postby Claire Lo 3C » Sat Sep 28, 2019 4:32 pm

So I was doing E5 on the textbook and it asks how many moles of people inhabit Earth if the estimated population is 7.0 billion people. This made me question the definition of 1 mole and Avogadro's number.

Alan Wu
Posts: 61
Joined: Sat Sep 14, 2019 12:16 am

Re: Avogradro's Number  [ENDORSED]

Postby Alan Wu » Sat Sep 28, 2019 4:40 pm

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.

sarahforman_Dis2I
Posts: 72
Joined: Sat Aug 17, 2019 12:18 am

Re: Avogradro's Number

Postby sarahforman_Dis2I » Sat Sep 28, 2019 4:42 pm

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.

Jialun Chen 4F
Posts: 66
Joined: Sat Sep 07, 2019 12:16 am

Re: Avogradro's Number

Postby Jialun Chen 4F » Sat Sep 28, 2019 5:28 pm

Try to think 1 mole as 1 dozen. Just as one dozen refers to 12 of some object, 1 mole refers to 6.022*10^23 of something. Avogadro's number is simply 6.022*10^23. Hope this can help.

Micah3J
Posts: 51
Joined: Tue Oct 08, 2019 12:16 am

Re: Avogradro's Number

Postby Micah3J » Fri Oct 11, 2019 12:29 am

Why is Avogradro's number based on Carbon 12?

Justin Quan 4I
Posts: 69
Joined: Sat Sep 14, 2019 12:17 am

Re: Avogradro's Number

Postby Justin Quan 4I » Fri Oct 11, 2019 9:19 am

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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