Oxybenzone is used in sunscreen because it offers protection in the UVA and UVB regions.oxybenzoneUse Beer's Law and data provided in the table to determine how many milligrams of oxybenzone are present in 2.5 mL ofsunscreen.Molar mass of oxybenzone = 228.2 g/molMolar ExtinctionPathlength of UV Volume of SunscreenAbsorbance WavelengthCoefficientcellSample0.95290 nm14365 M-'cm-11.0 cm2.5 mLHow many milligrams of oxybenzone are present in 2.5 mL of sunscreen?mg

Given , Absorbance = 0.95 Extinction coefficient = 14365 Path length = 1 cm Volume= 2.5 ml Molar…

Answered: HO, oxybenzone se Beer's Law and data…

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter20: Molecular Spectroscopy And Photochemistry

Section: Chapter Questions

Problem 6P

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A certain mixture of gasoline obtained from a petroleum refinery plant was found to contain only isooctane (C8H18; FM = 114.22), methyl tert-butyl ether (C5H12O; FM = 88.15), and tetraethyl lead (C8H20Pb; FM = 323.4), a gasoline preservative. Upon complete combustion of 0.4582 g sample, it was found out that the mass of the CO2 (FM = 44.01) absorbent increases by 1.0702 g, while the mass of residue PbO (FM = 223.2) was determined to be 0.0964 g. From this data, calculate the following: a. % (w/w) C8H18b. % (w/w) C5H12Oc. % (w/w) C8H20Pbd. % (w/w) Pb (FM = 207.2) Answer a to c only
A certain mixture of gasoline obtained from a petroleum refinery plant was found to contain only isooctane (C8H18; FM = 114.22), methyl tert-butyl ether (C5H12O; FM = 88.15), and tetraethyl lead (C8H20Pb; FM = 323.4), a gasoline preservative. Upon complete combustion of 0.4582 g sample, it was found out that the mass of the CO2 (FM = 44.01) absorbent increases by 1.0702 g, while the mass of residue PbO (FM = 223.2) was determined to be 0.0964 g. From this data, calculate the following: a. % (w/w) C8H18b. % (w/w) C5H12Oc. % (w/w) C8H20Pbd. % (w/w) Pb (FM = 207.2) Answer Letter D only
A certain mixture of gasoline obtained from a petroleum refinery plant was found to contain only isooctane (C8H18; FM=114.22), methyl tert-butyl ether (C5H12O); FM=88.15), and tetraethyl lead (C8H20Pb; FM=323.4), a gasoline preservative. Upon complete combustion of 0.4582 g sample, it was found out that the mass of the CO2 (FM = 44.01) absorbent increases by 1.0702 g, while the mass of residue PbO (FM = 223.2) was determined to be 0.0964 g. From this data, calculate the following: a. % (w/w) C8H18b. % (w/w) C5H12Oc. % (w/w) C8H20Pb
Assuming that sunlight produces 3.066 ? 1022 UV Photons/m2sand that the skin absorbs one-half of thesephotons (and reflects the other half), calculate the total UV energy absorbed over 0.42 m2of skin thatis exposed to sunlight for one hour. Assume that the average wavelength of the UV photons is 330 nm.
The ultraviolet spectrum can be divided into three regionsbased on wavelength: UV-A (315–400 nm), UV-B (280–315nm), and UV-C (100–280 nm). (a) Photons from whichregion have the highest energy and therefore are the mostharmful to living tissue? (b) In the absence of ozone, whichof these three regions, if any, are absorbed by the atmosphere?(c) When appropriate concentrations of ozone arepresent in the stratosphere, is all of the UV light absorbedbefore reaching the Earth’s surface? If not, which region orregions are not filtered out?
Paints and vanishes for use on exteriors of buildings must be protected from the effects of solar radiation which accelerate their degradation (photolyiss and photochemical reactions). Given that: M=500 g/mol; Emax=15,000 L/mol/cm for lambdamax=350nm. What must be the concentration (expresses in g/L) of a UV additive M such that 90% of the radiation is absorbed by a coating of thickness 0.3mm? thank u so much.
The average bond enthalpies of the C—F and C—Cl bondsare 485 kJ/mol and 328 kJ/mol, respectively. (a) What isthe maximum wavelength that a photon can possess andstill have sufficient energy to break the C—F and C—Clbonds, respectively? (b) Given the fact that O2, N2, andO in the upper atmosphere absorb most of the light withwavelengths shorter than 240 nm, would you expect thephotodissociation of C—F bonds to be significant in thelower atmosphere?
Using beer lambert's law: A= e.c.l ( l is the path length=1cm) determine the extinciton coeffiecient from the absorbance vs concentration graph.
Chlorophyll absorbs photons strongly in two bands, one between 340 and 450 nm and the other between 650 and 680 nm. Chlorophyll collects and transfers the photon energy to fix CO2 into carbohydrate CH2O units according to CO2 + H2O → (CH2O) + O2 where the (CH2O) indicates one carbon unit of the carbohydrate. The average enthalpy change for the addition of a carbon unit to a carbohydrate is ΔH = 485 kJ/mol. What is the minimum number of 660 nm photons needed by chlorophyll to add a carbon unit to a carbohydrate? (Remember that there’s no such thing as a partial photon.) Please no copy paste from anywhere
Chlorophyll absorbs photons strongly in two bands, one between 340 and 450 nm and the other between 650 and 680 nm. Chlorophyll collects and transfers the photon energy to fix CO2 into carbohydrate CH2O units according to CO2 + H2O → (CH2O) + O2 where the (CH2O) indicates one carbon unit of the carbohydrate. The average enthalpy change for the addition of a carbon unit to a carbohydrate is ΔH = 485 kJ/mol. What is the minimum number of 660 nm photons needed by chlorophyll to add a carbon unit to a carbohydrate? (Remember that there’s no such thing as a partial photon.) Please no copy paste
In a typical ultrasound, sound waves travel through liver tissue at a rate of 1540 m/s. How many cm will the wave travel in 23.69 μs?
(give clear handwritten solution) Select wavelengths ranges in nano meters is associated with UV spectroscopy?

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