Having Difficulty With Chemistry Conversion Problem. Please Help!!!

[confused2021]

I am having difficulty with the following problem:

If you dissolve 360mg glucose (Formula Weight: 180.16g/mole) in 5mL of water:


1.What is the concentration of glucose in mM and µM?

I got 360 mg x 1mole/180.16 g = .002 moles

.002 moles x .005L = 1 x 10^-5 M x 1 x10^3 mM/1M = 1 x 10^-3 mM glucose

1 x 10^-3 mM x 1x 10^-3micromolar/1mM = 1 x 10^-5 micromolar glucose



2.If you take 5mL of this solution and dilute it to 500mL what is the concentration of the glucose in the resulting solution in µM?

I used c1v1=c2v2

(1 x 10^-5 micromolar)(5mL) = (C₂)(500 mL) = 1 x 10 ^-7 microMolar



3.How many nanomoles of glucose are present in 10mL of the diluted solution?

I am having difficulty with number 3. Can anyone tell me if numbers 1 and 2 are right and also how I can solve number 3. Any input will be greatly appreciated!!!!

[ChenBeier]

Your final calculation in 1 is wrong.
M = mol/l
So you have to divide the 0.002 mol by 5 ml = 0,0004 mol/ml = 0,4 mol/l = 400 mM

Everything followed has the error.

[Manabor]

Cool. Thanks for the Thread

[reenaa]

Going to any kind of best centre is basically pointless. There are many out their. Many that push homework sheets in large classroom settings that charge a small fortune.

[ChenBeier]

This comment doesnt help.