How to Convert Grams to Mol/L Concentration


Aqueous chemicals (dissolved in water) are often used because the amount of the chemical added to a reaction can be carefully controlled by very exactly selecting the volume of solution. In order to determine the amount of a chemical in a volume of water, you must first determine the solution's molarity (mol/L). You will determine this given the mass of the compound added to a given volume of water, as well as the chemical composition of the compound.

  • Determine the molecular mass of the compound. For each atom type in the chemical, multiply its atomic mass by the number of that atom in the chemical. Sum these products to determine the chemical's molecular mass. For example, glucose, C6H12O6, has 6 carbon (atomic mass 12g) atoms, 12 hydrogen (atomic mass 1g) atoms and 6 oxygen (atomic mass 16g) atoms. So, sugar's molecular mass is 6 x 12g + 12 x 1g + 6 x 16g = 180g.

  • Divide the mass of the chemical added to a given volume of water by its molecular mass to find the number of moles of that chemical that will be added to the volume. For example, if you are adding 270g of glucose to a volume of water, then 270g / 180g/mol = 1.5 mol.

  • Divide the number of moles added to a volume of water by the volume in liters to determine the molarity (mol/L) of the solution. For example, adding 270g of glucose (1.5 mol) to 3 liters of water yields a molarity of 1.5mol / 3liters = 0.5 mol/L for the solution.

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