225mL of glycerol C3H8O3 in 2500 mL if aqueous solution dens
22.5mL of glycerol (C3H8O3) in 250.0 mL if aqueous solution (density of glycerol= 1.265 g/ml) at 20 degrees C.
What\'s the osmotic pressure?
I keep getting 18.51 atm as an answer, but this is incorrect. Please help!
Solution
mass of glycerol = 22.5*1.265 = 28.4625 g
moles of glycerol = 28.4625/92.1 = 0.309moles
total volume = 250ml = 0.25L
so concentration M = 0.309/0.25 = 1.236M
P = MRT
P = 1.236*0.082*293 = 29.696 atm

