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1. You have a stack of 100 sheets of cellophane. At 300 nm a single sheet absorbs 5% of the light. Using Excel, plot the power of the transmitted light as a function of sheets in the stack. What fraction of an incident light beam passes through the stack? 2. You have a solution with an unknown concentration of three absorbing substances X, Y, and Z in a 1 cm path length cuvette. Given the following information, calculate the concentration of X, Y, and Z. A at 21=0.61 8 A at 12=1.09 x Y Z M 100 200 300 m-1cm-1 A at in 200 500 400 m-1cm-1 A3 300 200 100 m-1cm-1

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