Answer:
This unknown compound has a molar mass of 33.74g/mole
Explanation:
<u>Step 1:</u> Given data
The formula for the osmotic pressure is:
π = MRT = 14.5 atm
⇒ with M = Concentration of the solution
⇒ with R = gas constant = 0.08206 L atm / mol K
⇒ with T = absolute temperature (in Kelvin) = 298K
<u>Step 2:</u> Calculate concentration
M = π/ RT
M = 14.5 / (0.08206 * 298)
M = 0.593 M this is 0.593 moles per L
<u>Step 3:</u> Calculate number of moles
Since the volume is only 0.250 L, the amount of moles is:
0.593 * 0.250 L = 0.1482 moles
<u>Step 4:</u> Calculate molar mass
The molar mass is : mass / moles
Molar mass of this unknown compund = 5g / 0.1482 moles = 33.74 g/mole
This unknown compound has a molar mass of 33.74g/ mole
