Homework Help: Chemistry

Posted by Sherryl on Monday, February 8, 2010 at 10:54pm.

A student placed 14.0 of glucose () in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.- mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform. A 55.0- sample of this glucose solution was diluted to 0.500 . How many grams of glucose are in 100. of the final solution?

Chemistry - DrBob222, Monday, February 8, 2010 at 11:06pm
What are the units for crying out loud?
Are all of them 100 mL. I will assume that is what you meant except for the dilution which I assume is 0.500 L or 500 mL.
14 g/100 = 0.14 g/mL
You took 55 mL of that so you have in the aliquot of 55 mL exactly 0.14 g/mL x 55 mL = 7.70 g. Now you put that 7.70 g into 500 mL so you now have 7.70 g/500 mL = 0.0154 g/mL. If you want the amount in 100 mL it is just 100 x that. Check my thinking.

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