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Problem- While cleaning the organic stockroom, a student found a bottle of ethanol labeled "Denatured with Benzene." He decided to determine the concentration of benzene in the ethanol by acquiring the UV spectrum of the liquid in a 2.0 cm cell.
The spectrum exhibited an absorption band at 260 nm which was attributable to benzene, and the absorbance of this band was 0.69. In a reference source, the student found that the molar absorptivity of this benzene band in ethanol was 230 M-1cm-1. Show how the student calculated the concentration of the benzene in the ethanol.
State your answer to three major figures and include the appropriate units.
the human eye contains a molecule called 11-cis-retinalthat changes conformation when struck with light of
A chemist needs to determine the concentration of a solution of nitric acid HNO3, She puts 865mL of the acid in a flask along with a few drops of indicator. She then slowly adds 0.600M Ba(OH)2 to the flask until the solution turns pink, indicating..
The IR spectrum of HCN shows 3 absorption bands at 3312 cm^-1, 2089 cm ^-1, and 712cm^-1. From this info alone can you deduce whether HCN is linear or not? Explain.
An open flask sitting in a lab fridge looks empty, but we know that actually it is filled with a mixture of gases called air. If the flask volume is 4.00 L, and the air is at standard temperature and pressure,
A galvanic (voltaic) cell consists of an electrode composed of iron in a 1.0 M iron(II) ion solution and another electrode composed of copper in a 1.0 M copper(II) ion solution
Given a buret filled with 0.13 M acetic acid and a second buret filled with 0.17 M sodium acetate, how many milliliters of each solution should be mixed together to produce 23.5 mL of a solution with a pH of 4.82
Explain the efffect of temperature on the solubility of gases in liquid? What effect does pressure have on the solubility of gases in liquid( Henry's Law)?
Vitamin B12, also known as cobalamin, has the molecular formula C63H88N14PO14Co. What mass of CO2 and H20 would be produced during the combustion analysis
Calculate the maximum wavelength of light with sufficient energy to dissociate a diatomic chlorine molecule into chlorine radicals.
Aluminum sulfide reacts with water to form aluminum hydroxide and hydrogen sulfide.
how much energy in kilojoules is needed to heat 4.00 of ice from -12.5 to 32.0? the heat of fusion of water is 6.01 and
Question- Mark took an asprin tablet that weighed .364g and dissolved it in 250 mL of water. Calculate the concentration (Molarity) of the asprin (acetylsalicylic acid) solution she prepared.
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