A solution of a compound in ethanol shows an absorbance of 0.46 at 238 nm in a c

Question

A solution of a compound in ethanol shows an absorbance of 0.46 at 238 nm in a cell with a 1-cm light path. Its molar absorptivity in ethanol at that wavelength is 12, 600 M^-1 cm^-1. What is the concentration of the compound? Express your answer to two significant figures and include the appropriate units. A 4.9 Times 10^-5M solution of a compound in hexane shows an absorbance of 0.44 at 252 nm in a cell with a 1-cm light path. What is the molar absorptivity of the compound in hexane at 252 nm? Express your answer to two significant figures. Describe a way to determine the rate of the alcohol dehydrogenase catalyzed oxidation of ethanol by NAD^+ NADH is formed as a product it absorbs light at 340 nm Therefore, the rate of the oxidation reaction can be determined by monitoring the increase in absorbance at 340 nm as a function of time. Acetaldehyde is formed as a product it absorbs light at 340 nm Therefore, the rate of the oxidation reaction can be determined by monitoring the increase in absorbance at 340 nm as a function of time. NAD^+ is a reactant it absorbs light at 340 nm Therefore, the rate of the oxidation reaction can be determined by monitoring the decrease in absorbance at 340 nm as a function of time Ethanol is a reactant it absorbs light at 340 nm Therefore, the r3te of the oxidation reaction can be determined by monitoring the decrease in absorbance at 340 nm as a function of time. Which of the following compounds contains oxygen, has no absorption above 3100 cm^-1, and none between 1650 and 1780cm^-1? CH_3COCH_2CH_3 CH_3CH_2OCH_2CH__3 CH_3CH_2CH_2OH CH_3CO_2CH_2

Explanation / Answer

A = e * l * C
a = absorption
e = molar absortivity
l = length of th tube
c = concentration of solution
0.46 = 12600 * 1 * C
C = 3.65 * 10^-5 M

0.44 = e * 1 * 4.9 * 10^-5
e = 8979.592 M^-1 Cm^-1

CH3-CH2-O-CH2-CH3 has ether functional group and it does not show the peaks above 3100 cm^-1 and between 1650 to 1780 cm^-1

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