## anonymous 4 years ago If there are 15x10^23 atoms of carbon in a sample, how many moles are there?

1. anonymous

$15*10^{23}*6.022*10^{21}$

2. anonymous

$=9.033*10^{45} atoms$

3. anonymous

is this correct?

4. Preetha

Brent, how do you convert atoms to moles?

5. anonymous

is that not correct?

6. Preetha

Looks right, you just multiplied it right?

7. anonymous

yes

8. Preetha

Next step? Xishem answered something similar earlier in your other question. So now you have to put in the right equation.

9. anonymous

That is incorrect. You have to divide the # of atoms in the sample by Avogadro's #.$\frac {15*10^{23} atoms}{6.02*10^{23} atoms/mol} \approx 2.49 mol$

10. Preetha

Rogue is correct. I was hasty. I concede.

11. anonymous

Just make sure to see that you units make sense as a way of checking :)

12. Preetha

And you are only in school, Rogue. Brilliant career ahead of you!

13. Preetha

Brent, you have to make sure you know how to do these and understand the logic. Many people here can help you by explaining it. But you have to try to understand the concepts!