Both mol/L and g/l are units of concentrations. Mol/L is molar concentration while g/L is mass concentration.
Concentration refers to the amount of substance in a solution. The two main ways of measuring concentration are;
The molar concentration is measured in mol/L and describes the amount of substance in a litre of solution.
The mass concentration is measured in g/L and measures the mass of the substance in 1 L of solution.
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