We’re being asked to determine the mass of an unknown compound with a molar mass of 50 g/mol if the boiling point of the aqueous solution is 101.02 ˚C.
For this problem, we have to follow the steps:
Step 1. Establish the necessary equations
Step 2. Calculate for molality
Step 3. Calculate for mass
Step 1. Recall that the boiling point of a solution is higher than that of the pure solvent and the change in boiling point (ΔTb) is given by:
What mass in grams of a molecular substance (molar mass = 50.0 g/mol) must be added to 500 g of water to produce a solution that boils at 101.02 °C? (Kbp = 0.512 °C/m for water.)
a. 43 g
b. 50 g
c. 78 g
d. 92 g
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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Boiling Point Elevation concept. If you need more Boiling Point Elevation practice, you can also practice Boiling Point Elevation practice problems.
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