A student placed 18.5 g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-mL mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform. A 60.0- sample of this glucose solution was diluted to 0.500 L. How many grams of glucose are in 100. mL of the final solution?
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Basically it's 18.5g/100*60 (to get 60ml of the 100ml solution) and then this answer divided by 5 to get the amount left in 100ml of the second solution, which was originally 500ml