Question

Calculate the amount in grams and lbs required to raise the boiling point of 5 gallons of pasta water by 3 degrees farenheight. Show your work and explain.

Answer 1

The elevation in boiling point required = 3 ⁰F = 1.667 ⁰C

Elevation in boiling point is a colligative property

Elevation in boiling point = Tb X Molality

Tb = 0.512 °C kg/mol)

Molality = Moles of solute / Mass of water

Mass of water = 5 gallons = 18.93 Kg

1.667 = 0.512 X molality

Molality = 3.26 molal

moles of solute = Molality X mass in Kg of solvent = 3.26 X 18.93 = 61.71 moles

Mass of solute = Moles X molecular weight

so if we know the molecular weight of solute we can calculate mass of solute