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percent by mass =

(mass of solute) / (mass of solute + mass of solvent) x 100%

Ex: if you need a 12% by mass solution of salt then the easiest way is to get 12 g salt and 88 g of water thus the total is 100 g. 12 / (12+88) x 100% = 12%

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Q: How do you prepare an aqueous solution as a percentage?
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