amandax014
how many molecules of glucose are in a 2.0 mL of a 1.02 mM solution of glucose
Delete
Share
This Question is Closed
aaronq
Best Response
You've already chosen the best response.
0
find the amount of moles using the formula for molarity:
Molarity = moles/Liters of solution
then multiply the number of moles by avogadros number
aaronq
Best Response
You've already chosen the best response.
0
ps. convert to mM to M.
1 mM = 0.001 M
amandax014
Best Response
You've already chosen the best response.
0
so calculate the mass C6H12O6? then divide that by 1.02?
aaronq
Best Response
You've already chosen the best response.
0
no, you don't need the molar mass since you're not converting to grams
amandax014
Best Response
You've already chosen the best response.
0
i'm just lost on the moles then how do i find that
aaronq
Best Response
You've already chosen the best response.
0
with the molarity and the volume of solution given
aaronq
Best Response
You've already chosen the best response.
0
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
amandax014
Best Response
You've already chosen the best response.
0
so like \[\frac{ 2mL }{ 1mm} X \frac{ 1mm }{ 0.001 } ?\]
aaronq
Best Response
You've already chosen the best response.
0
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 =
amandax014
Best Response
You've already chosen the best response.
0
2.04X10^-6
aaronq
Best Response
You've already chosen the best response.
0
looks right, i don't have a calculator around to check though
amandax014
Best Response
You've already chosen the best response.
0
ok thank you so much
aaronq
Best Response
You've already chosen the best response.
0
no problem
aaronq
Best Response
You've already chosen the best response.
0
ps you still need to multiply by avogadros number
amandax014
Best Response
You've already chosen the best response.
0
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
aaronq
Best Response
You've already chosen the best response.
0
yep, it's 2.04x10^-4 though don't forget
amandax014
Best Response
You've already chosen the best response.
0
why 10^-4 i got -6
aaronq
Best Response
You've already chosen the best response.
0
sorry -6 lol my mistake
amandax014
Best Response
You've already chosen the best response.
0
haha its ok thank you again
aaronq
Best Response
You've already chosen the best response.
0
lol no prob, good luck