The light-stimulated conversion of 11-cis-retinal to 11-trans-retinal is central to the vision process in humans. This reaction also occurs (more slowly) in the absence of light. At 80.0 ∘C∘C in heptane solution, the reaction is first order with a rate constant of 1.02×10−5/s. What is the molarity of 11-cis-retinal after 6.00 h if its initial concentration is 3.7×10−3 M ? How many minutes does it take for 25 %% of the 11-cis-retinal to react? How many hours does it take for the concentration of 11-trans-retinal to reach 3.15×10−3 M? (Note: 11-cis-retinal + 11-trans-retinal = total amount of retinal in eye)

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