Final answer:
The molar mass of hexachlorophene can be determined by calculating the change in boiling point of chloroform caused by the dissolved substance and using the boiling point elevation formula, provided that the ebullioscopic constant of chloroform is known.
Step-by-step explanation:
To determine the molar mass of the compound hexachlorophene used in germicidal soap, you need to calculate how much the boiling point of chloroform increases when the compound is dissolved in it. The data given suggests that dissolving 0.640 g of hexachlorophene in 25.0 g of chloroform raises the boiling point to 61.93°C.
The next steps would involve using the boiling point elevation formula: ΔTb = Kbm, where ΔTb is the boiling point elevation, Kb is the ebullioscopic constant of chloroform, and m is the molality of the solution. Since the change in boiling point (ΔTb) and the mass of hexachlorophene are given, you can solve for the molar mass if the Kb value for chloroform is known from reference materials.
Without the actual values of the boiling point elevation constant and the boiling point of pure chloroform, we cannot compute the molar mass of hexachlorophene. However, with all necessary data, the calculation is straightforward and yields the molar mass of the compound.