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Unformatted text preview: obennoskey (blo242) – Pre-lab 7 – Lyon – (52635) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This pre-lab assignment is due March 24 by 8AM. 001 10.0 points What is meant by the term ”molar absorp- tivity” with regard to spectroscopic measure- ments? What units are usually used for molar absorptivity? 1. Molar absorbtivity is a measure of how many moles of a substance are absorbed by visible light. The units are moles per nanome- ter. 2. Molar absorptivity is a measure of how strongly a compound absorbs light at a par- ticular wavelength. The units commonly used are cm − 1 M − 1 . correct 3. Molar absorptivity refers to how much deionized water one mole of a substance can absorb before it begins to dissolve. The units are liters per mole. 4. Molar absorptivity ranges from 0 to 1 and indicates how much of the light shining on a sample was absorbed. The units on molar absorptivity are absorbancy units. 5. Molar absorptivity is how much light one mole of a substance absorbs at 25 ◦ C. Molar absorptivity is unitless. Explanation: 002 10.0 points What is the relationship between absorbance and transmittance? What value of ab- sorbance corresponds to 65.0% transmit- tance?...
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- Spring '10
- Light, Visible spectrum