Convert 340 torr to atmospheres. torr/760 = atm
Then pi = MRT.
Substitute and solve for M = molarity.
Convert M to mols; M = mols/L. You have M and L, solve for mols.
Convert mols to molar mass; mols = grams/molar mass. You have mols and grams, solve for molar mass.
Can you follow up with b?
A biochemical engineer isolates a bacterial gene fragment and dissolves a 15.1 mg sample of the material in enough water to make 32.7 mL of solution. The osmotic pressure of the solution is 0.340 torr at 25°C.
a) What is the molar mass of the gene fragment?
b) If the solution density is 0.997 g/mL, how large is the freezing point depression for this solution (Kf of water=1.86°C/m)?
1 answer
1 answer