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12-19-2006, 07:58 AM
hello

please could you help me in :

converting 10 microgram/ml to micromol/ml , the substrate Mw is 139.11
and
converting 10 micromol/ml to microgram/ml , the substrate Mw is 139.11
and what is the formula which should be used in both of these cases?

thank you

Unregistered
01-29-2008, 10:22 PM
microgram/ml ----> micromol/ml
From mol = weight(g) / MW
so you take : 10/139.11 micromol
The result is = 0.072 micromol/ml

Unregistered
11-08-2008, 01:42 AM
convert 107 microgram per mL of pNPP to micromoles
molecular weight is 371.15 gm

JohnS
11-08-2008, 12:17 PM
convert 107 microgram per mL of pNPP to micromoles
molecular weight is 371.15 gm

The actual units of molecular weight are unified atomic mass units (u) or daltons (Da). However, it is numerically equal to molar mass in grams per mole (g/mol), so

197 µg/mL x 1 mol/371.15 g = 0.531 µmol/mL or 531 nmol/mL.

Mrs X
11-08-2008, 03:15 PM
Hi magee, you have asked for something slightly different in both questions. Make sure you use the correct units, otherwise you will get your answer 1000 times wrong. - There are 1000mL in 1L, they can't be used interchangeably.

Unregistered
03-08-2009, 05:10 PM
Hi,

Can you help me to show the computation on how to arrive in this results:

Electolytes in 1000mL
Sodium 120mmol
Potassium 4mmol
Calciumk2.7mmol
Chloride109mmol
Lactate28mmol

and this

Electrolytes 1000ml
Sodium 56mmol
Chloride56mmol
Chloride56mmol
Dextrose50mg/L

Unregistered
07-31-2009, 09:09 AM
how to convert 10mM TO microgram

JohnS
07-31-2009, 09:35 AM
how to convert 10mM TO microgram

You need to identify the substance and its molar mass to convert between grams and moles.

However, a 10 nM solution is a concentration so first you need to know the volume used just to determine the number of moles or millimoles.

JP1986UM
08-05-2009, 10:56 AM
I need to convert (196g/mol) caffeine (1c) which contains 100mg at 150mL to 10mM.

So in other words, how many cups to reach 10mM?

I can't wrap my head around it.

Thanks

JohnS
08-05-2009, 11:23 AM
I need to convert (196g/mol) caffeine (1c) which contains 100mg at 150mL to 10mM.

So in other words, how many cups to reach 10mM?

I can't wrap my head around it.

Thanks.
I think there may be some confusion between moles and Molar. A 10 milliMolar solution is 10 mmol/L concentration. If your caffeine concentration is 100 mg/150 mL, then it is 666.7 mg/L or 3.4 mmol/L (3.4 mM). You would have to brew it nearly 3X stronger.

However, I suspect you are asking how much to reach 10 mmol. At 196 g/mol, it is also 196 mg/mmol, so 10 mmol is 1960 mg. At 100 mg/(small) cup, you could have 19.6 cups of 150 mL, or 2.94 L of coffee.

Since I probably drink (way) too much coffee, but not that much, what is the significance of 10 mmol of caffeine?

JP1986UM
08-05-2009, 12:22 PM
It's the point at which caffeine interferes with the DNA checkpoint during mitosis for replication and would cause problems and likely cancer development.

So if the math is right, then you have to drink over 20 cups per day to have that happen for a designated period of time.

Thanks so much for your help!

Unregistered
08-09-2009, 12:45 AM
I got a proline content of 5microgram per ml. I want to convert to micromole (MW 115.13)

JohnS
08-09-2009, 02:44 AM
I got a proline content of 5microgram per ml. I want to convert to micromole (MW 115.13)

The molar mass is equal to the MW, 115.13 g/mol

5µg/mL x 1 mol/115.13 g = 0.043 µmol/mL
probably better expressed as 43 nmol/mL.

Unregistered
08-25-2009, 06:32 AM
If I have a substance with MWT = 404.8. I gave measured it as 46.26 microgram per ml. How many micromole per liter is 42.26 ug/ml?

JohnS
08-25-2009, 06:59 AM
If I have a substance with MWT = 404.8. I gave measured it as 46.26 microgram per ml. How many micromole per liter is 42.26 ug/ml?

Not sure if you mean 46.26 or 42.26, but
46.26 µg/mL x 1 mol/404.8 g = 0.1143 µmol/mL
(or 114.3 nmol/mL)

Unregistered
05-17-2010, 01:20 PM
I need to convert 24.385mmol/l of calcium into mg/100ml
MW Ca = 40.088

JohnS
05-17-2010, 03:51 PM
I need to convert 24.385mmol/l of calcium into mg/100ml
MW Ca = 40.088

The MW is numerically equal to the molar mass in grams per mole.
Also 100 mL = 1 dL

24.385 mmol/L x 40.088 g/mol x 1 L/10 dL = 97.75 mg/dL

Unregistered
05-24-2010, 01:33 PM
I need to convert 25 mM nystatin to µg.

Unregistered
05-24-2010, 01:52 PM
Hello,

please could you help me in :

converting 25 mM to µg, the substrate Mw is 926,11 g/mol. It is nystatin.

I will be very grateful for your help!

kaarzynka_wolak
05-24-2010, 02:20 PM
Hello,

I need to convert 25 mM to µg, MW nystatin = 926,11 g/mol

I will be very grateful for your help!

JohnS
05-24-2010, 03:36 PM
Hello,

I need to convert 25 mM to µg, MW nystatin = 926,11 g/mol

I will be very grateful for your help!

I'm not sure if you mean 25 mM or 25 mmol. "M" for Molar is a concentration, moles per liter, so 25 mM = 25 mmol/L. With the MW, you can convert to a concentration in grams (with some prefix) per liter.

25 mmol/L x 926.11 g/mol = 23153 mg/L = 23.153 mg/L or 23.153 µg/mL.
(note: I am using a point for the decimal marker)

Unregistered
03-05-2011, 03:12 AM
how many millimols of potassium in a 10mls ampoule containing 150mg/ml of potassium chloride

JohnS
03-05-2011, 06:57 AM
how many millimols of potassium in a 10mls ampoule containing 150mg/ml of potassium chloride

150 mg/mL x 10 mL = 1500 mg
Molar mass of KCl is 74.55 g/mol

1500 mg x 1 mol/74.55 g = 20.1 mmol of KCl
Based on chemical formula, this is also 20.1 mmol of K+

Unregistered
06-08-2011, 08:44 PM
hi! i need a 10 micromolar solution of a substance with 139.11 MW. how many grams do i need to make up a 15 ml solution with 10 micromolar concentration?

I computed 0.0000208 g of the substance to make up the concentration and volume i need. Did I do it right?

JohnS
06-09-2011, 08:36 AM
hi! i need a 10 micromolar solution of a substance with 139.11 MW. how many grams do i need to make up a 15 ml solution with 10 micromolar concentration?

I computed 0.0000208 g of the substance to make up the concentration and volume i need. Did I do it right?

Yes, but I'd write it as 20.8 µg to make it more readable. Easy to make a mistake with all those leading zeroes. Other choice is 2.08 x 10^-4 g.

Unregistered
07-11-2011, 05:41 AM
converting milliosmol/ml to gram/ml

kobusodendaal
07-20-2011, 02:44 PM
I would like to know what measure system USA uses for sugar levels and how to convert to mmol/l

JohnS
07-20-2011, 04:07 PM
I would like to know what measure system USA uses for sugar levels and how to convert to mmol/l

Do you mean blood glucose?
See this for a reference: http://jama.ama-assn.org/site/misc/auinst_si.xhtml

We use mg/dL. Multiply mg/dL by 0.0555 (or divide by 18) for mmol/L

The factor comes from the molar mass for glucose (approx 180 g/mol) and 10 dL/L.

carol z
07-21-2011, 11:36 AM
please convert form me 9g/l of Nacl to mmol/ml

JohnS
07-21-2011, 11:44 AM
please convert form me 9g/l of Nacl to mmol/ml

Molar mass of NaCl is 58.44 g/mol
9 g/L x 1 mol/58.44 g x 1000 mmol/molx 1 L/1000 mL = 0.154 mmol/mL (or mol/L)

Unregistered
12-27-2011, 11:00 AM
I'm getting confused trying to convert mM to g/ml: I have a final concentration of 0.0001mM and need to convert that to mg/ml. The MW is 355.33

JohnS
12-27-2011, 02:21 PM
I'm getting confused trying to convert mM to g/ml: I have a final concentration of 0.0001mM and need to convert that to mg/ml. The MW is 355.33

0.0001 mM is 0.1 µmol/L or 100 nmol/L
100 nmol/L x 355.33 g/mol = 35533 ng/L or 35.533 µg/L
It is also 35.533 ng/mL

It would look silly but you can move decimal six places left to get mg/L.

Unregistered
05-17-2012, 05:29 AM
I need converting 0,0003mmol(allicin)/ml to microgram/ml.
PM allicin 162,28g/mol