When 20 g of glucovanillin (an organic compound found in the green fruit of vanilla) are dissolved in 200 g...

When 20 g of glucovanillin (an organic compound found in the green fruit of vanilla) are dissolved in 200 g phenol, the boiling point of the new solution was observed to be 183°C. What is the molecular weight of the compound?

Answer:
The boiling point of phenol is 181.7 °C
Delta T = 183 - 181.7 = 1.3 °C
Kb of phenol is 3.56
Delta T = kb x m
m is the molality = moles solute / Kg solvent
200 g = 0.200 Kg
1.3 = 3.56 x m
m = 0.365
0.365 = moles solute / 0.200
moles solute = 0.0730
20 g / 0.0730 moles = 273.8 g/mol

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