If there are 15x10^23 atoms of carbon in a sample, how many moles are there?

Question

anonymous · Answer

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

anonymous · Answer

$$=9.033*10^{45}      atoms$$

anonymous · Answer

is this correct?

preetha · Answer

Brent, how do you convert atoms to moles?

anonymous · Answer

is that not correct?

preetha · Answer

Looks right, you just multiplied it right?

anonymous · Answer

yes

preetha · Answer

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

rogue · Answer

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

preetha · Answer

Rogue is correct.  I was hasty. I concede.

rogue · Answer

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

preetha · Answer

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

preetha · Answer

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!