Chemistry 2002 JAMB Past Questions - Question 3: A little quantity of trichloromethane (b.pt. 60°C) was added to a large quantity of ethanol (b.pt. 78°C). The most probable boiling point of the resultant mixture is from

Correct Answer

D

Explanation

The boiling point of a mixture of liquids depends on the composition of the mixture and the vapor pressures of the individual components. In this case, trichloromethane (chloroform) and ethanol are being mixed.

Chloroform has a boiling point of 60°C, and ethanol has a boiling point of 78°C. When the two substances are mixed, the resulting boiling point of the mixture will typically be between the boiling points of the two components.

The exact boiling point of the mixture can be determined using Raoult's law, which states that the vapor pressure of a component in an ideal mixture is directly proportional to its mole fraction in the mixture.

Without specific information about the quantities of trichloromethane and ethanol added, it's challenging to provide an exact boiling point for the mixture. However, it's reasonable to expect that the boiling point of the mixture will fall somewhere between the boiling points of trichloromethane (60°C) and ethanol (78°C), with the exact value depending on the proportions of the two substances in the mixture.