convert mg/l or mg/kg into cmol/kg

[Guest]

please help, i need to convert mg/l or mg/kg for cec into cmol/kg. thanx in advance

[JohnS]

Re: convert mg/l or mg/kg into cmol/kg

please help, i need to convert mg/l or mg/kg for cec into cmol/kg. thanx in advance

Is the latter unit really centimole per kilogram? (I've never seen centimole used before). Assuming so, to convert between grams and moles you need the molar mass. That means you need to identify the substance and its molecular (or atomic) weight. I have no idea what cec is.

[Guest]

Re: convert mg/l or mg/kg into cmol/kg

Is the latter unit really centimole per kilogram? (I've never seen centimole used before). Assuming so, to convert between grams and moles you need the molar mass. That means you need to identify the substance and its molecular (or atomic) weight. I have no idea what cec is.

cec-cation exchange capacity. thanks so much. i will try that

[Ssemugooma Francis]

I need help, how do I convert 229.53 Mg/L of Magnesium to Cmol)kg

[JohnS]

I need help, how do I convert 229.53 Mg/L of Magnesium to Cmol)kg

First note that case matters in the SI, I assume you mean milligrams (mg), not megagrams, and the symbol for the prefixes centi- is c. C is the symbol for coulombs, a unit of electrical charge.

You need the molar mass of magnesium (numerically equal in grams per mole to the atomic weight of magnesium). Divide 0.22953 g/L by the molar mass to get moles per liter. Now divide by the density of the solution (which you did not specify) to convert from liters to kilograms. Use the definition of the prefixes to adjust the number to the desired units.

If this is a dilute solution in water, it may be reasonable to assume density is approximately 1 kg/L,but that is questionable if you hope to retain five significant figures.