Question

Glucose, C6H12O6, is a naturally occurring sugar used as an energy source in many organisms. A 0.392 M solution of glucose in water has a density of 1.196 g/mL at 20 oC. What is the molal concentration of the solution? (Please note: numbers are randomly generated and the density for the given molarity may not necessarily be true to life)

Answer 1

1 molal glucose solution means,1 mole of glucose in 1000 g of water.

1 molar solution of glucose means, 1 mole of glucose in 1000 mL solution.

0.392 molar solution of glucose means, 0.392 moles of glucose in 1000 mL solution.

Now if the density of the solution is = 1.196 g/mL

then the weight of 1000 mL solution = (1.196*1000) = 1196 g

so, in 1196 g water, the number of moles glucose = 0.392 moles

in 1000 g water, the number of moles glucose =(0.392*1000)/1196= 0.328 moles

so the glucose solution is 0.328 molal.

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