Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene (? = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60$\degree$C? K_b = 3.63$\degree$C/m, boiling point of pure chloroform = 61.70$\degree$C A) 12.6 g B) 17.2 g C) 31.0 g D) 34.4 g E) 101 g

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Explanation:The boiling point elevation is given by the equation:$$\Delta T_b = K_b * m$$where $\Delta T_b$ is the change in boiling point, $K_b$ is the boiling point elevation constant, and $m$ is the molality of the solution.We can rearrange this equation to solve for the molality:$$m = \frac{\Delta T_b}{K_b}$$Substituting the given values into this equation, we get:$$m = \frac{62.60\degree C - 61.70\degree C}{3.63\degree C/m} = 0.248 m$$The molality is defined as the number of moles of solute per kilogram of solvent. We can use this to calculate the mass of hexachlorophene that must be added to the solution:$$mass = moles * molar mass$$$$moles = molality * mass of solvent$$$$mass = molality * mass of solvent * molar mass$$Substituting the given values into this equation, we get:$$mass = 0.248 m * 125 g * 406.9 g/mol = 12.6 g$$Therefore, the correct answer is A) 12.6 g.

Hexachlorophene Is Used as a Disinfectant in Germicidal Soaps °\degree° C? Kb = 3

Hexachlorophene Is Used as a Disinfectant in Germicidal Soaps $\degree$ C? K_b = 3