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Laser atomic fluorescence excitation and emission spectra of Na in an air acetylene flame are shown. in the excitation spectrum the laser was scanned through various wavelengths while the detector monochromator was held fixed near 589 nm. In the emission spectrum, the laser was fixed at 589.0 nm and the detector monochromator wavelength was varied. Explain why the emission spectrum gives one broad band, whereas the excitation spectrum gives two sharp lines. How can the excitation linewidths be much narrower than the detector monochromator bandwidth?
if the partial pressure of NO is decreasing at a rate of 56 torr/min what is the rate of change of the total pressure of the vessel?
A 269 mg sample of rock was found to have 2.45 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.45 × 10-6 mol of argon-40. How old was the rock? What assumption is made about the origin of the argon-40?. Enter your answer in scientific notat..
What are the steps to determine isotope fractionation between water and vapor at 25 degrees C
If the minimum energy required to break the C-Cl bond in CF3Cl is 540 kJ/mol, what is the longest wavelength of radiation that will break this bond?
Provide the mechanism (showing all steps and curved arrows) for the dehydration of 4-methylcyclohexanol in the presence of sulfuric acid.
A sample of gas has a volume of 1.55 L at 35 °C and 1.05 atm. What is the pressure (in torr) if the volume changes to 1.38 L and temperature to -28 °C.
a balloon is filled with hehelium of 500.0ml nbspat 27 0c and 755 mm hg. in the atmosphere whennbsp the balloon rises
Determine how much oxygen in grams is formed by the complete reaction of 38.88 of Na2O2.
In a battery, water is used as a salt bridge, and the two electrodes are Carbon and Aluminum. Find the standard reduction potential of the battery, and indicate which electrodes are cathode and anode.
A reverse osmosis unit is used to obtain drinkable water from a source that contains 0.570 g NaCl per liter. What is the minimum pressure (in torr) that must be applied across the semipermeable membrane to obtain water. Assume room temperature or ..
An average adult inhales a volume of 0.50 l of air with each breath. if the air is warmed from room temperature (20c) to body temperature (37c) while in the lungs.
A certain reaction has an Eact of 62.3 kj/mol (14.9 kcal/mol) and a frequency factor of 7.15X10^8LXmil-1Xsec-1. use the arrhenius equation to calculate the rate constant for this reaction at 35 degrees c
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