a) The structure of octocrylene, which is used in some sunscreens, is shown below. Explain why octocrylene is able to be used as a sunscreen. Clearly highlight the part of the molecule responsible for sunscreen action.
b)b) A 1026 mg sample of sunscreen containing octocrylene was extracted with ethanol and the final volume of the solution was 25.0 mL. Using a 1 cm path length sample cell, the absorbance of the solution was determined to be 4.77 at 304 nm. The molar absorptivity of octocrylene in ethanol at this wavelength is 350 L mol–1 cm–1 and the molar mass of this compound is 361 g mol–1. Calculate the mass percentage of octocrylene in the sunscreen.
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