AP Chemistry - Boiling Point Elevation Worksheet
1.   Explain why a nonvolatile solute dissolved in water makes the system have a higher boiling point then pure water.
 
2. Calculate what the boiling point would be of 2.00 m sugar in water.
 
3. Glycerol, C3H8O3, (formula weight 92) , is essentially a nonvolatile liquid that is very soluble in water.  A solution is made by dissolving 46.0 g of glycerol in 250 g of water.  Calculate the boiling point of the solution at an atmospheric pressure of 1 atm.
 
4. A solution of 14 g of an unknown (molecular) compound in 1 kg of benzene boiled at 81.7oC.  Calculate the formula weight of the unknown.
 
5. The action of hot concentrated nitric acid (dissolved in sulfuric acid) on benzene produces nitrobenzene, C6H5NO2, as the chief product.  A by-product is often obtained,  which consists of 42.86% C, 2.40% H, and 16.67% N with the remainder being oxygen.
a)  Calculate the empirical formula of the formula of this by-product.

b)   The boiling point of a solution of 5.5 g of this by-product in 45 g of benzene was 1.84oC higher than that of pure benzene.  Calculate a formula weight based on the above data, and determine the actual molecular formula for the compound.