A compound having molecular weight 151.163 g/mol is determined in a sample. A 0.0302 g sample was dissolved in an aqueous solvent and diluted the solution to 1 L. The solution has λ max at 243 nm (ε=2.6×104 cm-1 mol-1 L). The solution exhibits an absorbance of 0.642 in a 2 cm cell. Calculate the percentage of the above compound in the sample.

Q: A solution of a specific vitamin has a åmax of 271 nm and a concentration of 2.73 × 10-7M. The…

A: Given that : Concentration of the solution (C) = 2.73 x 10-7 M Absorbance of the solution (A) =…

Q: Assume for the following situations that Beer’s law remains linear. For (a) and (b), indicate…

A: Beer’s law is given by,        A=ε×c×lWhere,        A=absorbance of the solution        ε=…

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Q: What is the absorbance of a 0.00250 M sample in a 1.15 cm cell if ɛɛ is 48.3? O 0.139 0.278 O 1.39…

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Q: A blue product absorbs light at 590 nm (ε590nm = 7,600 M-1 cm-1). Its concentration was too…

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Q: Aciortence 2. Use the absorbance-concentration graph given below to find the value of absorptivity…

A: Lambert-Beer Law is utilized to measure the concentration of a sample in a solution using absorbance…

Q: A 1.3 * 10-5M solution of an unknown substance has an absorbance of 0.345 at its λmax. Calculate the…

A:

Q: A mixture is prepared by combining 10.72 mL of 2.52 x 10-3 M Fe(NO3)3 with 10.00 mL of 1.76 x 10-3 M…

A: Given that: Initial concentration of Fe(NO3)3 is 2.52 x 10-3 M. Volume of Fe(NO3)3 solution is 10.72…

Q: (b=1.00 cm). Suppose you measure the absorbance of a yellow dye solution in a 1.00 cm cuvette The…

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Q: A specific steroid has a Amax of 285 nm and a molar absorptivity e of 11, 500 L mol-¹ cm-¹. What is…

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Q: A plot of Absorbance vs. molarity of Fe(SCN)2+ from part one of the lab gives a straight line with…

A: The equation of calibration curve line is given as, => y = 51 x Given : Absorbance of sample =…

Q: What is the molar concentration for a solution with a measured absorbance of 0.212 based on this…

A: According to Beer-Lambert’s law, the absorbance of solution can be expressed as:

Q: The absorption coefficient of O2 in seawater at 0°C is 1.7 mmol/L.What is the concentration of O2 if…

A: Given information,        The absorption coefficient of O2 in seawater at 0°C is 1.7 mmol/L.

Q: What is the concentration (in M) of a FeSCN2+ solution that has an absorbance of 0.217? trendline…

A: y = (4.2 x 103)x + 0.023 Where, Y = absorbance and x = concentration

Q: Please refer to the graph in the lab document. If the absorbance of a containing FeSCN2+ is found to…

A: We are given a plot of absorbance vs concentration  Equation => y = 4713.6x  Y = absorbance  X =…

Q: A sample in a 1cm cuvette gives an absorbance reading of 0.6. If the absorptivity for this sample is…

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Q: How do you calculate the amount of µmoles, if the absorbance is 0.019, the extinction coefficient is…

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Q: Estimate the Ka of a weak acid from the data given below. One gram quantities of the acid were…

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Q: A mixture is prepared by combining 11.18 mL of 2.31 x 103 M Fe(NO)3 with 10.0o0 mL of 1.89 x 103 M…

A: Given that : The volume of Fe(NO3)3=11.18 mLMolarity of Fe(NO3)3=2.31×10-3MThe volume of KSCN=10.00…

Q: A specific steroid has a Amax of 251 nm and a molar absorptivity e of 11, 500 L mol-¹ cm-¹. What is…

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Q: Sample Blank $2 $3 $4 $5 $6 $7 $8 $9 $10 Stock of Fe Stock of SC Volume Fe3+, mL 2.000 2.000 2.000…

A: From the given data we have  Concentration of [FeNCS2+]=[SCN-] Basing on the given chart we have to…

Q: concentration for a solution having an absorbance of 0.350 and a molar absorptivity of 420 L mol-1…

A: Absorbance is directly proportional to concentration

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Q: help fill out this sheet based on structure

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Q: Avobenzone is used in sunscreens. A UV spectrum of a 3.0 mL sample of avobenzone (310.4 g/mol) in a…

A: The volume of avobenzene sample = 3.0 mLLength of the cell, l = 1.0 cmMolar exctinction coefficient…

Q: Using the following data, if an unknown solution of Orange Dye X had a measured absorbance of 0.345,…

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Q: Compound with 103 x 6.74 molar (3) absorption What concentration of the compound is required to form…

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Q: Concentration of Manganese in Red Wine 0.6 y = 0.1373x + 0.122 R2 = 0.9986 0.5 0.4 0.3 0.2 0.1 0.5 1…

A: The linear regression equation for the Absorbance versus manganese concentration (ppm) graph is Y =…

Q: A standard solution contains 100 ppm of Fe, which was found to have an absorbance of 0.151 au at 508…

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Q: A student wants to determine the concentration of iron ion in a 15.000 gram solid that contains…

A: As the solution is absorbing green light, the color of the solution would be red according to color…

Q: For one of your trials during the equilibrium experiment at room temperature as described in the lab…

A: To find out the equilibrium constant for the following reaction  Fe3+(aq) + SCN-(aq) ⇌…

Q: Ben ran through the experiment and found the best-fit line listed below for his standard calibration…

A: Given , absorbance of solution = 0.432  Volume of 0.002 M iron(III) nitrate = 5.00 mL Volume of…

Q: 0.4545 g CaCO3 was dissolved in HCl and the resulting solution was diluted to 0.25 L. Twenty-five mL…

A: Mass of CaCO3 = 0.4545 g Molar mass of CaCO3 = 100 g/mol Number of moles of CaCO3 = mass/molar mass…

Q: A water sample has been analyzed for phosphate using UVVS method at 662 nm wavelength. The molar…

A: A numerical problem based on Beer-Lambert law, which is to be accomplished.

Q: Compund AFK has a maximum absorbance of 650 nm. Its molar absorptivity at 650 is 8400 M−1cm−1 and…

A: A = εcl  A = absorbance  ε = absorptivity coefficient (M-1cm-1)  c = concentration of solution…

Q: A 10 μL aqueous sample containing 1 attogram of Rb+ was injected into a graphite furnace atomic…

A: Given : Volume of solution = 10 μL = 0.01 mL                                 (since 1 mL = 1000 μL )…

Q: Turn in the graph you produced in Excel The value of absorptivity constant (k) is What is the…

A: The graph between absorbance versus concentration is to be plotted here.

Q: The max of aspirin (molar mass 180g/mol) in neutral solution is 225 nm and e is 650 mol ¹Lcm-1. An…

A: Concept of Beer's law is required for calculation of concentration of aspirin solution According to…

Q: Calculate the equilibrium concentration of FeSCN^2 Please explain.

A: Given: Beaker [FeSCN+2] Absorbance 1. 1.6*10-4 M 0.582 2. 1.2*10-4 M 0.448 3. 0.8*10-4 M…

Q: If the absorbance for the solution was 0.698, calculate the equilibrium concentration of iron(III)…

A: It is  based on the Lambert  Beer Law, Here we are required to find the equilibrium concentration of…

Q: Draw the mechanism and product for each of the reactions in Problem 18.45 when they are catalyzed by…

A: (a) The mechanism of the first compound catalyzed by a base is given below :

Q: What is the concentration (in Molar) of a 1.00 cm (path length) sample that has an absorbance of…

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.