For example, if the concentration of sodium chloride solution is 308mmol/l, then the volume mass concentration is 58.5 * (308/1000) =18.0g/L.

This is the conversion between molar mass and mass, which inevitably involves the molar mass of solute. Let the molar mass of solute (formerly called molecular weight) be m; 1 mole/liter = mg/liter = 1000 mg/liter.

For example: 1mol/L sodium chloride (M=58.5) solution. 1mol/L = 58.5 x 1.0g/L = 58500mg/L

The concentration is expressed by the number of moles of solute contained in 1 liter solution. The physical quantity of solution composition is expressed by the quantity (number of moles) of solute substance contained in unit volume, which is called the molar concentration of solute, also called the quantity concentration of solute substance.

Conversion formula of concentration unit:

1, equivalent concentration =1000.d. mass percentage concentration/e.

2. Mass percentage concentration = equivalent concentration e/1000.d. ..

3. molar concentration = 1000.d mass concentration/m.

4. Mass concentration = mass-volume concentration (mg/L)/10.d. ..

5. Mass-volume concentration (mg/L)= 10 mass percentage concentration.