Question
6.00 g of hemoglobin was dissolved in 250.0 mL of solution. The resulting osmotic pressure was 6.80 mmHg at 23.0C. what is the molar mass of hemoglobin?
Answers
DrBob222
Convert 6.80 mm Hg to atmospheres. 6.80/760 = ? = pi (not 3.14 but pi in this case is osmotic pressure).
pi = MRT
pi from above.
You know R and T (remember T must be in kelvin).
Solve for M = molarity = mols/L
You know M and L, solve for mols.
Then mols = grams/molar mass. You know mols and grams, solve for molar mass.
Post your work if you get stuck.
pi = MRT
pi from above.
You know R and T (remember T must be in kelvin).
Solve for M = molarity = mols/L
You know M and L, solve for mols.
Then mols = grams/molar mass. You know mols and grams, solve for molar mass.
Post your work if you get stuck.
libby
got it! thanks so much