If We Know the Amount of Light That Is Absorbed

question 74

Multiple Choice

If we know the amount of light that is absorbed in a solution, we can calculate the concentration of the substance dissolved in water using a spectrophotometer. For a certain substance the concentration (in moles/liter) is given by the formula , where is the intensity of the incident light and is the intensity of light that emerges. What is the concentration of the substance if the intensity is 45% of ?

• A) 952 mol/L
• B) -3,667 mol/L
• C) 2,928 mol/L
• D) 2,192 mol/L
• E) 1,272 mol/L

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