Ryan23 Posted January 25, 2009 Share Posted January 25, 2009 How do you make 200ml of a 0.1M solution of a substance that has a molecular weight of 121.1g/mol? Link to comment Share on other sites More sharing options...
CaptainPanic Posted January 26, 2009 Share Posted January 26, 2009 If something has a molecular weigth of 121.1 g/mol, and you need 0.1 M (0.1 M means 0.1 mol/liter)... The info is right in front of you. You should realize that a mol is just a "number of molecules" (but a very large number). It's the same as a dozen or any number. Dozen = 12 Gross = 144 (12*12) Mol = 6.022*10^23 How do you make 200 liter of a 10 eggs/liter mix when the eggs are have a weight of 121.1g/dozen (they're tiny eggs)? I.e. how many grams of egg do you have to add? I'm sure you can answer that question. Just do the same for the molecules. They're a bit smaller, but in the end, the question is the same (note, I changed the numbers a bit, so the answer is, obviously, not the same for both questions). Good luck... and sorry for not giving the answer - we don't answer homework questions here. We want you to learn. Link to comment Share on other sites More sharing options...
CharonY Posted January 26, 2009 Share Posted January 26, 2009 This is homework, I'll move it. Wheee Tris buffer! Link to comment Share on other sites More sharing options...
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