# A student placed 18.0 of glucose (c6h12o6) in a volumetric flask....?

A student placed 18.0 of glucose (c6h12o6) 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 35.0-sample of this glucose solution was diluted to 0.500 . How many grams of glucose are in 100. of the final solution?

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work out the concentration of the original solution

conc. = mass / volume

= 18.0 g / 100 ml

= 0.180 g/ml

you took 35.0 ml of this solution, find the mass of glucose in this 35.0 ml

mass = concentration x volume

= 0.180 g/ml x 35.0 ml

= 6.30 g

Now, this 6.30 g of glucose was diluted to a total volume of 500 ml

then you took 100 ml of it

So you took 1/5 of the 6.30 g

1/5 x 6.30 g

= 1.26 g of glucoe is in 100 ml of the final solution

• Anonymous
4 years ago

stressful one. In a hundred mL of the 1st soln., you have 19.5g. you're taking 0.4 of that concentration (pattern/total, so 40/a hundred) and dilute it to 500 mL. So in a million/5th (a hundred mL) of that answer, you have (19.5×0.4)/5 g, or a million.56g glucose.

• The answer is 0.720 g