Wednesday, June 23, 2010

How would you make up a 2M solution for sucrose (342g)?

I don't understand why you would multiply 342g by 2M. Why wouldnt u divide 342g by 2M to find the liters?How would you make up a 2M solution for sucrose (342g)?
I'd dissolve 68.4 g of sucrose in 100 mL of water.





You must choose your volume. The math is then





(X L) x (2 mol/L) x (342 g/mol) = 684 x X grams





See how the units cancel? Dissolve that much in X L to get a 2 M solution.How would you make up a 2M solution for sucrose (342g)?
342 g is the molar mass of sucrose. That is it is equal to 1 mole





To make 2M soln, you must dissolve 1 mol in 0.5 l or 2 mol in 1 l.

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