Question

what is the molality of a 10.5% by mass glucose solution?. density of the solution is 1.03g/ml

can someone please explain how to do this question. please and thank you

Answer 1

10.5% by mass means 10.5 g glucose/100 g solution. That is
10.5 g glucose/(10.5 g glucose + 89.5 g H2O).
moles glucose = 10.5/180 = ??
molality = moles glucose/kg solvent =
0.0583/0.0895 = ??

Answer 2

thank you!