chemistry molarity conversion question?

Question

this problem says that i have a concentration of 9.00x10^18 molecules/cm^3 of NO. this isn't the correct unit for molarity right? how do i convert it to the correct moles/liters unit?

for the top, do i use avogadro's number? and for the bottom, convert to m^3? but i don't see how i can do that with the number.

thanks for your help!

Answer 1

well, you need to start by dividing 9.00x10^18 molecules by Avogadro's number.
Then, you would convert cm^3 to mL.
They are equivalent, so you don't have to do anything except change the measurements.
Lastly, you would just convert the mL to L.

So, basically, your answer is 9.00x10^18 divided by Avogadro's number (which would then be in moles) and go from cm^3 to mL and covert to L.
So you would have your answer in moles/Liters.

i hope i helped.
I'm not very good at explaining chemistry.
=/

Answer 2

1 cu cm = 1 mL

9.00x10^18molecules/1mL x 1mol/6.02x10^23molecules x 1000mL/1L = 1.50x10^-2 moles/L