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One way to measure ionization energies is ultraviolet photoelectron spectroscopy (UPS, or just PES), a technique based on the photoelectric effect. In PES, monochromatic light is directed onto a sample, causing electrons to be emitted. The kinetic energy of the emitted electrons is measured. The difference between the energy of the photons and the kinetic energy of the electrons corresponds to the energy needed to remove the electrons (that is, the ionization energy). Suppose that a PES experiment is performed in which mercury vapor is irradiated with ultraviolet light of wavelength 91.5 nm. (a) What is the energy of a photon of this light in eV (1 eV = 1.602e-19J)?
An unknown mass of each of the given substances as with The final temperature is recorded as indicated 1.Pyrex glass (tf=67.6 C), 2.Sand (tf=70.4 C), 3.ethanol (tf=45.9 C), initially at 19.0 degrees celsius, absorbs 1930 Joules of heat
A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of a 2.18 g sample burns in excess oxygen yields 3.94 g of CO2 and 1.89 g of H2O. A separate experiment shows that a 1.23 g sample contains 0.235 g of N.
A zero-order reaction has a constant rate of 1.60×10-4 . If after 35.0 seconds the concentration has dropped to 2.50×10-2 , what was the initial concentration?
Waste streams from various processes in a complex chemical facility are combined and burned for heat, because the cost of purifying and recycling the components is prohibitive
A 0.1000 m aqueous solution of a weak acid, HA, is 1.5% ionized. At what temperature does it freeze? Kf for water = 1.86°C/m.
Determine the molarity of a solution formed by dissolving 15.79 grams of CaCl 2 , calcium chloride in 200.grams of H 2 O, water?
At a certain temperature, a volume of 100 mL of saturated barium carbonate solution contains 0.00216 g of BaCO3 (MW=197.3 g/mol).
Using the Henderson Hasselbalch equation, calculate the amount of monosodium phosphate (NaH2PO4, MW=120.01 g/mol) and disodium phosphate (Na2HPO4, MW=141.96 g/mol) required to prepare 100.mL of a 200. mM phosphate bugger of pH 6.5
What mass of water, in grams, produces 729 J when cooled from 58.0 degrees Celsius to 28.0 degrees Celsius? The specific heat capacity of water is 4.184 J/g.°C.
how many ml of concentrated sulfuric acid would be required to mae 1 L of 0.2N solution
what is the maximum wavelength of light that can be used to observe the photoelectric effect? answer in nm.
Oxalic acid is a diprotic acid that occurs naturally in some plants. Calculate the pH and the concentrations of all species present in a 0.36-M solution.
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