conversion

[irenairena78]

Can someone convert me mg/l to mmol/l.Please give me the answer as soon as possible
Thank you

[JohnS]

Originally Posted by irenairena78

Can someone convert me mg/l to mmol/l.Please give me the answer as soon as possible
Thank you

Sure, just divide by the molar mass in grams per mole. You have to know the substance and either look up its molecular weight or calculate it from chemical formula. The molecular weight is numerically equal to the molar mass in grams per mole. In general, it is unique to the substance.

[irenairena78]

Thank you!
So,if I need to convert 220 mg/l CaCo3 to mmol/l it is gonna be 220mg/l * 100 g/mol*1g/1000mg.Is it ok my calculation?

[irenairena78]

Sorry,as i can see i have to divide 220 mg/l with molar mass.So,220mg/l/100 g/mol*1g/1000mg cause i need mg.

[Mrs X]

Originally Posted by irenairena78

Sorry,as i can see i have to divide 220 mg/l with molar mass.So,220mg/l/100 g/mol*1g/1000mg cause i need mg.

220mg/L CaCO3 = 2.2mmol/L

For CaCO3, there are 100.1g/L for a 1M solution, there are 100.1mg/L for a 1mM solution.

[irenairena78]

Thank you Mrs X