convert mg/l to mmol/l

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convert mg/l to mmol/l

Postby ts » Thu Feb 26, 2004 1:24 am

How do you convert 12.2 mg/l to mmol/l?

Re: convert mg/l to mmol/l

Postby Knight » Thu Feb 26, 2004 4:27 am

ts wrote:How do you convert 12.2 mg/l to mmol/l?
As previously discussed, you need to know the molecular weight of the fraction you are converting.


mg/l is an expression of weight per volume, while mmol/l the amount of substance per liter (The official definition of the mole is "1 mole of particles is equal to the number of atoms in exactly 12g of carbon-12")

1 mole H2O is the number of molecules in 18.015 g H2O
1 mole H2 is the number of molecules in 2.016 g H2.

By knowing the molecular weight of a substance, you can convert its weight per liter to the amount per liter.

So, to answer your question, we need to know how many mg/l of what.
William J. Knight
Health Physicist
Los Alamos National Labs
User avatar
Posts: 309
Joined: Tue Jan 13, 2004 9:43 pm
Location: Los Alamos, NM

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