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# 1. If the molar extinction coefficient () of a compound is 2.5 x 10 5 mol -1 lcm -1 at 528 nm and the Abs (at 528 nm) = 0.254 find the concentration of that solution. (assume a path length of 1.0 cm) 2. If a student measures a sample that gives an Abs = 1.85 at the max

1. If the molar extinction coefficient (ε) of a compound is 2.5 x 10 ^{5 } mol ^{-1 }lcm ^{-1 } at 528 nm and the Abs (at 528 nm) = 0.254 find the concentration of that solution. (assume a path length of 1.0 cm)

2. If a student measures a sample that gives an Abs = 1.85 at the λ _{max }, is this data reliable? If not, then what might they do to improve their data?

3. If your stock solution has a concentration of 0.75 M and you want to make 250 mL of a solution that has a concentration of 4.8 x 10 ^{-2 }M, how much stock solution will you need?

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