123coco Posted October 30, 2009 Report Share Posted October 30, 2009 Hi, can someone help me with this....I think I'm missing some information What is the mass percent of 1.0 n of NaCl (aq) solution by definition mass percent= m-solute/ m-solute + m-solvent what I don't get is why they're assuming that there's 1000g of solvent? Is it a tacit rule that when you're dealing with aq solution there's 1000g of water so the answer is: 5.53% thanks ________ Suzuki gn125 Link to comment Share on other sites More sharing options...
dan0105 Posted October 31, 2009 Report Share Posted October 31, 2009 Its because the units are in things like "moles/L" or grams/L, etc. And the per L is per L of solvent. In the case of pure water, 1L just so happens to also be 1kg, ie 1000g. (Water actually has a density of .997 g/cm^3 and 1 cm^3 of water is 1 mL. so its more like 997g, but close enough for the mcat...) Link to comment Share on other sites More sharing options...
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