If a solution of glucose in water is labelled as 10 % w/w, what would be the molality of the solution if density of solution is 1.2 g mL-1?

Question

If a solution of glucose in water is labelled as 10 % w/w, what would be the molality of the solution if density of solution is 1.2 g mL-1? (A) 0.066 m (B) 0.617 m (C) 1.56 m (D) 5.06 m

Tardigrade Admin · Accepted Answer

Let mass of solution = 100 g, ∴ Mass of glucose = 10 g, Mass of water = 90 g No. of moles of 10 g glucose = (10/108) = 0.0555 mol, No. of moles of H2O = (90/18) = 5 mol Volume of solution = (100/1.2 mL) = 83.33 mL = 0.0833 L Molality = ( textnumber of moles of solute/ textMass of solvent in kg) = (0.0555 mol/0.090 kg)

Q. If a solution of glucose in water is labelled as $10% w / w$ , what would be the molality of the solution if density of solution is $1.2 g m L^{- 1}$ ?

$0.066 m$

$0.617 m$

$1.56 m$

$5.06 m$

Q. If a solution of glucose in water is labelled as 10%w/w, what would be the molality of the solution if density of solution is 1.2gmL−1?

0.066m

0.617m

1.56m

5.06m

Let mass of solution =100g, ∴ Mass of glucose =10g, Mass of water =90g No. of moles of 10g glucose=10810​=0.0555 mol, No. of moles of H2​O=1890​=5 mol Volume of solution =1.2mL100​=83.33mL=0.0833L Molality =Mass of solvent in kgnumber of moles of solute​ =0.090kg0.0555mol​

Q. If a solution of glucose in water is labelled as $10% w / w$ , what would be the molality of the solution if density of solution is $1.2 g m L^{- 1}$ ?

$0.066 m$

$0.617 m$

$1.56 m$

$5.06 m$