## E.7 calculate atoms in moles

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Hannah_1G
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### E.7 calculate atoms in moles

The question gives how many carbon atoms are in a molecule of DNA and to calculate in moles how many atoms of carbon there are. Is this asking to divide the number of atoms by moles to be in terms of mole or to multiple the amount of carbon by Avogadro's constant to find the true amount of atoms? Sorry if that doesn't make sense.

Chem_Mod
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### Re: E.7 calculate atoms in moles

This question is essentially asking you to convert some amount of carbon atoms to moles of carbon. The whole DNA part is extra, it is just to give some real world context. To solve this problem, you would convert atoms to moles by dividing the atoms by avogadro's number.

Shutong Hou_1F
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### Re: E.7 calculate atoms in moles

1 mole is the number of atoms in 12 grams of carbon 12, which equals 6.022 * 10^23 (Avogadro constant).
Specifically for this question, I think that it could be solved by dividing the number of carbon atoms by Avogadro constant, according to the definition of 1 mole.

905416023
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### Re: E.7 calculate atoms in moles

I took the 2.1 x 10^9 atoms of C and divided it by Avogadro's number, or 6.022 x 10^23. This gives you the moles of carbon because you are dividing atoms of carbon by atoms per moles, which leaves you with moles of carbon. You have canceled out the atoms.

Aliya Roserie 4F
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Joined: Fri Aug 09, 2019 12:16 am

### Re: E.7 calculate atoms in moles

Shutong Hou_3I wrote:1 mole is the number of atoms in 12 grams of carbon 12, which equals 6.022 * 10^23 (Avogadro constant).
Specifically for this question, I think that it could be solved by dividing the number of carbon atoms by Avogadro constant, according to the definition of 1 mole.

This was very helpful. Thank you for this. I was stuck on a problem that requires using the conversion in regards to atoms and Avogadro's number.

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