Fundamentals E.7

[Shania Garrison Discussion 3E]

Hi, I am working on the syllabus questions and I cant seem to figure out how to do E.7. I also am having a hard time finding it on chemistry community, so here is the problem:
E.7 A molecule of human DNA was found to contain
atoms of carbon. Calculate the chemical amount (in moles) of carbon atoms in the molecule of DNA.

What are the steps you would take to solve this?

[Shania Garrison Discussion 3E]

Oh wait I think I misinterpreted and thought it was that many C's for 1 mole of DNA molecules, not just that many C's for 1 molecule alone.

[ashna kumar 3k]

In order to do this problem, we must remember that in one mole of any substance there are 6.022*10^23 formula units of it.

In this question, given that there are 2.1*10^9 C atoms, we divide this by 6.022*10^23 atoms.mol-1 to get 3.48*10^-15 moles.

[kylanjin]

Since there are 2.1*10^9 C atoms, dividing by Avagadro's number 6.022*10^23 atoms.mol-1 would make the units cancel and leave you with moles of C, which is what you're aiming for.

[Sabira Mohammed 3I]

Hi, For this one you would just divide the number of atoms given by Avogadro's number in order to get moles of C.