Question

References Use the References to access important values if needed for this question. The nonvolatile, nonelectrolyte aspirin, CyH804 (180.1 g/mol), is soluble in chloroform CHCl3. Calculate the osmotic pressure (in atm) generated when 14.3 grams of aspirin are dissolved in 188 mL of a chloroform solution at 298 K. atm Submit Answer

Answer 1

1)

mass, m = 14.3 g

use:

number of mol,

n = mass/molar mass

=(14.3 g)/(180.1 g/mol)

= 7.94*10^-2 mol

volume , V = 188 mL

= 0.188 L

use:

Molarity,

M = number of mol / volume in L

= 7.94*10^-2/0.188

= 0.4223 M

T = 298 K

use:

P = C*R*T

P = 0.4223*0.08206*298.0

P = 10.33 atm

Answer: 10.3 atm

2)

P = 4.35atm

T = 298 K

use:

P = C*R*T

4.35 = C*0.08206*298.0

C =0.1779 M

volume , V = 1.99*10^2 mL

= 0.199 L

use:

number of mol,

n = Molarity * Volume

= 0.1779*0.199

= 3.54*10^-2 mol

use:

mass,

m = number of mol * molar mass

= 3.54*10^-2*2.884*10^2

= 10.21 g

Answer: 10.2 g