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In the analytical sciences, concentrations of molecules are commonly quoted in Molar units (moles per litre). This calc allows conversion between this and some other units.
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A 1 M solution is considered to have a high concentration. Many large molecules are even too massivle to be able to achieve this concentration. Pure concentrated sulfuric acid has a concentration of approximately 10 M and pure water has a concentration of ~55 M. In analytical science, concentrations of µM or mM are more commonly used.
Molar and other concentration measures (e.g wt%, ppm) can not be exhanged without taking into account the molecular mass of the solute. Another calc provides this conversion.