The concentration of a solution is usually expressed as 1M, or 1 mole/L, where one mole is is the formula weight (grams) of a molecule dissolved in one liter of water at standard temperature and pressure. The capital M can be expressed as mM (millimoles), uM (micromoles), nM (nanomoles) and smaller.
Concentration is sometimes expressed as mass per unit volume (mg/L, ug/uL), or as a percentage. A v/v percentage is the number of parts of solute (ex vinegar) in 100 parts of the solvent (ex water). A w/v percentage is the weight of the solute (in milligrams, grams, kilograms, etc.) in 100 mL of solvent.
We know that the 200 mL solution is double or two times the amount of a 100 mL solution, therefore the solute will also be double. The total number of grams of NaCl solute is 20 g in a 200 mL w/v 10% aqueous NaCl solution.
10 g x 2 / 100 mL x 2 = 20 g / 200 mL
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