Question

how many molecules of glucose are in a 2.0 mL of a 1.02 mM solution of glucose

Answer 1

find the amount of moles using the formula for molarity:

Molarity = moles/Liters of solution

then multiply the number of moles by avogadros number

Answer 2

ps. convert to mM to M.

1 mM = 0.001 M

Answer 3

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

Answer 4

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

Answer 5

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

Answer 6

with the molarity and the volume of solution given

Answer 7

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

Answer 8

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

Answer 9

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 =

Answer 10

2.04X10^-6

Answer 11

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

Answer 12

ok thank you so much

Answer 13

no problem

Answer 14

ps you still need to multiply by avogadros number

Answer 15

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

Answer 16

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

Answer 17

why 10^-4 i got -6

Answer 18

sorry -6 lol my mistake

Answer 19

haha its ok thank you again

Answer 20

lol no prob, good luck