Please note that the chemical formula is not limited to the known chemical compounds. Options for hiding the symbol or name of the elements provide a handy learning aid for memorizing the periodic table. Normality is equal to the molarity of the solution when molar mass is equal to the equivalent mass of the solute. Use this visual tool for calculating molar mass for any chemical formula. It can only be equal to or greater than the molarity of the solution. Note that normality of a solution is never less than molarity of the solution. Step 2: Divide the total mass of each element by the molar mass and multiply by 100 to find the mass. The expression used to calculate the percentage composition in w/v is Example: Find the percent composition by mass of potassium dichromate (K 2 Cr 2 O 7) Step 1: Find the molar mass of the compound.
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