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The energy needed to ionize an atom of Al when it is in its most stable state is 577.6 kJ mol-1. However, if an atom of Al is in a certain low-lying excited state, only 274.4kJ mol-1 is needed to ionize it. What is the wavelength of the radiation emitted when an atom of Al undergoes a transition from this excited state to the ground state?
Suppose that a radiologist who is 4.0 m from a small, unshielded source of radiation receives 3.4 units of radiation. To reduce the exposure to 0.34 units of radiation, to what distance from the source should the radiologist move?
what is the mechanism of how sodium hydroxide reacts with ester (lard) to form cardoxylic acid soap
You have a solution of a buffer with 10 mMoles of the buffer. Initially the solution has a pH of 6.8. You add 100 mM kOH and the pH rises to 7.1. The pKa of the buffer is 6.3.
Describe the apparent relationship between H3O and OH concentrations when an endpoint is reach in acid-base titration.
how much boiling water would you need in order to raise the bath to body temperature about 37? assume that no heat is
what is the slope of an arrhenius plot for the following reaction?2nocl ----gt 2no cl2temperature k k lmolbulls400 6.6
A buffer is initially prepared by adding 100 mLs of 0.500 M HOl to 60 mLs of 2.00 M NaOI. The mixture is brought to a final volume of 200 mL by adding water. What is the pH fo the buffer
Compare the length of a column of mercury to that of a column of water required to produce a pressure of 1.0 bar. the densities of mercury and water at 0C are for mercury 13.596g/cm^3 and for water .99987g/cm^3.
what is the importance of surface area particle size nucleation and diffusion rate in terms of solid state
How many grams of methane gas (CH4) need to be combusted to produce 18.2 L water vapor at 1.2 atm and 275 K? Show all of the work used to solve this problem. CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (g)
Problem- What is the molar mass of a nonpolar molecular compound if 5.52 grams dissolved in 36.0 grams of benzene begins to freeze at -1.87 °C? The freezing point of pure benzene is 5.50 °C and the freezing point depression constant, Kfp, is -5.12..
Explain the relative alternating tendencies in these copolymerization
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