What mass of ethylene glycol must be added to 1615g water to raise the boiling point...
What mass of ethylene glycol must be added to 1615g water to raise the boiling point to 104.3 degrees celcius?
Homework Answers
Boiling point elevation DTb = 104.3 - 100 = 4.3 deg C
Molality = DTb/Kb
= 4.3/0.512 = 8.398m
Moles of ethylene glycol = molality x mass of water in kg
= 8.398 x 1.615 = 13.56 mol
Mass of ethylene glycol = moles x molar mass of ethylene
glycol
= 13.56 x 62.07
= 842 g
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