Question
The boiling point of water at 756 mm Hg is 99.85 degree C. What mass percent of surcrose (C12H22O11) should be present to raise the boiling point to 100.00 degree C at this pressure?
Answers
DrBob222
delta T = Kb*molality.
Solve for molality.
molality = moles/kg solvent.
I would use 100 g water (0.1 kg) and solve for moles.
moles = grams/molar mass.
Solve for grams.
You now have grams in 0.1 kg solvent. You convert that to mass percent.
Solve for molality.
molality = moles/kg solvent.
I would use 100 g water (0.1 kg) and solve for moles.
moles = grams/molar mass.
Solve for grams.
You now have grams in 0.1 kg solvent. You convert that to mass percent.