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Bar-code scanners at supermarkets emit orange-red laser light with a wavelength of 633 nm. If the energy output of these scanners is 1.0 mJ per second, how many photons are released if the scanner operates for 2.0 seconds? otassiur metal

Bar-code scanners at supermarkets emit orange-red laser light with a wavelength of 633 nm. If the energy output of these scanners is 1.0 mJ per second, how many photons are released if the scanner operates for 2.0 seconds? otassiur metal

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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If 25.00 mL of 0.05000 M sodium carbonate solution is neutralized by 32.45 mL of hydrochloric acid, determine the concentration of the hydrochloric acid. b. 0.4201 g of an unknown monoprotic acid was dissolved in 25.00 mL of water and titrated with 0.09995 M NaOH. It was found that 38.76 mL of NAOH was required to reach the equivalence point. Determine the molecular weight of this unknown acid. 3. Attempt the following questions from a "virtual chemistry laboratory". a. Using the Bohr model of the atom, calculate the wavelength, frequency, wavenumber, and energy per mole for photons for the transition ni = 6 to n = 3 in hydrogen. Pasche %3D b. Based on the Bohr model of the atom, calculate the ionization energy for a single electron in C5+ if the electron begins in the n = 2 level. %3D C. Bar-code scanners at supermarkets emit orange-red laser light with a wavelength of 633 nm. If the energy output of these scanners is 1.0 mJ per second, how many photons are released if the scanner operates for 2.0 seconds? d. Determine the longest wavelength of radiation required to ionize a sample of potassium metal if the binding energy for the electron is 1760 kJ/mol. e. How many moles of photons are contained in a flash of 607 x 1012 Hż radiation that contains 20.21 kJ of energy? f. It is reported that the threshold frequency for zinc is 1.038 x 1015 s-1. Calculate the speed of emitted photoelectrons, as well as their maximum kinetic energy (in J and eV), when 195nm UV radiation strikes a piece of polished zinc. g. A number of compounds can be formed by combining atoms of nitrogen and oxygen. In our "virtual chemistry laboratory" you are told that one compound contains 30.45 % nitrogen by mass, while in a second compound it is only 25.94 % nitrogen by mass. Show that this data is ortions
Transcribed Image Text:If 25.00 mL of 0.05000 M sodium carbonate solution is neutralized by 32.45 mL of hydrochloric acid, determine the concentration of the hydrochloric acid. b. 0.4201 g of an unknown monoprotic acid was dissolved in 25.00 mL of water and titrated with 0.09995 M NaOH. It was found that 38.76 mL of NAOH was required to reach the equivalence point. Determine the molecular weight of this unknown acid. 3. Attempt the following questions from a "virtual chemistry laboratory". a. Using the Bohr model of the atom, calculate the wavelength, frequency, wavenumber, and energy per mole for photons for the transition ni = 6 to n = 3 in hydrogen. Pasche %3D b. Based on the Bohr model of the atom, calculate the ionization energy for a single electron in C5+ if the electron begins in the n = 2 level. %3D C. Bar-code scanners at supermarkets emit orange-red laser light with a wavelength of 633 nm. If the energy output of these scanners is 1.0 mJ per second, how many photons are released if the scanner operates for 2.0 seconds? d. Determine the longest wavelength of radiation required to ionize a sample of potassium metal if the binding energy for the electron is 1760 kJ/mol. e. How many moles of photons are contained in a flash of 607 x 1012 Hż radiation that contains 20.21 kJ of energy? f. It is reported that the threshold frequency for zinc is 1.038 x 1015 s-1. Calculate the speed of emitted photoelectrons, as well as their maximum kinetic energy (in J and eV), when 195nm UV radiation strikes a piece of polished zinc. g. A number of compounds can be formed by combining atoms of nitrogen and oxygen. In our "virtual chemistry laboratory" you are told that one compound contains 30.45 % nitrogen by mass, while in a second compound it is only 25.94 % nitrogen by mass. Show that this data is ortions
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