Answer:
The osmotic pressure of the solution is 0,60 atm
Explanation:
This is the formula for osmotic pressure.
π = n . R . T . i
where n is the molar concentration of solute (mol/L), R is the ideal gas constant, and T is the temperature in Kelvins. The i means the degree of dissociation of the solute, in this case it does not clarify it so we assume that it is a non-volatile solute, therefore the i is worth 1 .
1 dm³ = 1 L
So we have to get the moles.
Mass/ Molecular mass = Moles
69,7 g / 2790 g/m = 0,025 moles
T° in K = T° in °C + 273 ---> 20 + 273 = 293
π = 0,025 moles/L . 0,082 L.atm/K.mol . 293K . 1
π = 0,60 atm
