Triclosan is an antibacterial agent present in some soaps and surgical cleaning treatments. Calculate the mass of triclosan, C₁₂H₇Cl₃O₂, needed to prepare 750.0 mL of a 5.00 × 10^-5 M solution.

Question

Quizplus · Accepted Answer

To calculate the mass of triclosan needed, first determine its molar mass. Triclosan's chemical formula is C12H7Cl3O2. The molar mass is calculated as follows: (12 × 12.01 g/mol) + (7 × 1.01 g/mol) + (3 × 35.45 g/mol) + (2 × 16.00 g/mol) = 289.54 g/mol. To prepare a 5.00 × 10^-5 M solution in 750.0 mL (or 0.750 L), use the formula: mass = molarity × volume × molar mass. Thus, mass = 5.00 × 10^-5 mol/L × 0.750 L × 289.54 g/mol = 0.108 g, which rounds to 0.109 g.

Triclosan Is an Antibacterial Agent Present in Some Soaps and Surgical