## amandax014 Group Title how many molecules of glucose are in a 2.0 mL of a 1.02 mM solution of glucose one year ago one year ago

1. aaronq Group Title

find the amount of moles using the formula for molarity: Molarity = moles/Liters of solution then multiply the number of moles by avogadros number

2. aaronq Group Title

ps. convert to mM to M. 1 mM = 0.001 M

3. amandax014 Group Title

so calculate the mass C6H12O6? then divide that by 1.02?

4. aaronq Group Title

no, you don't need the molar mass since you're not converting to grams

5. amandax014 Group Title

i'm just lost on the moles then how do i find that

6. aaronq Group Title

with the molarity and the volume of solution given

7. aaronq Group Title

molarity is a form of expressing concentration (in terms of moles per liter).. so basically by multiplying the molarity by the volume, you find the moles but you have to covert to molarity because mM meaning millimolar, 1 molar = 0.001 millimolar

8. amandax014 Group Title

so like $\frac{ 2mL }{ 1mm} X \frac{ 1mm }{ 0.001 } ?$

9. aaronq Group Title

nope convert volume to liters .. 2mL = 0.002 L convert millimolarity to molarity 1.02 mM = 0.00102 M 0.00102 M x 0.002 L =

10. amandax014 Group Title

2.04X10^-6

11. aaronq Group Title

looks right, i don't have a calculator around to check though

12. amandax014 Group Title

ok thank you so much

13. aaronq Group Title

no problem

14. aaronq Group Title

ps you still need to multiply by avogadros number

15. amandax014 Group Title

yea i figured that I'm trying to get a better number I would take that equations answer 2.04 ... and multiply it by avogadro's number right

16. aaronq Group Title

yep, it's 2.04x10^-4 though don't forget

17. amandax014 Group Title

why 10^-4 i got -6

18. aaronq Group Title

sorry -6 lol my mistake

19. amandax014 Group Title

haha its ok thank you again

20. aaronq Group Title

lol no prob, good luck