Question

A student placed 18.0 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-mL sample of this glucose solution was diluted to 0.500 L. How many grams of glucose are in 100. mL of the final solution? Express your answer numerically in grams.

Answer 1

Stock solution made up of 100ml contains 18g of glucose (as given).

So, 18g of glucose is present in 100ml of solution.

100ml of solution contains 18g. of glucose.

60ml of solution contains ? g of glucose.

= (18/100)×60

= 10.8g

But this 10.8g containing glucose solution is made up to 0.5 L (500ml).

So, 500ml of this solution contains 10.8g of glucose.

Therefore 100ml of this final solution contains ? g of glucose

= (10.8/500)×100

= 2.16g

So, there will be 2.16g of glucose in 100ml of final solution.