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The charge of an electron is -1.602 x 10-19 C. For the photoelectric effect, how many microamperes (1 A = 1 C/s) of electrical current are produced when a metal is bombarded by 3.70x1013 photons each second? Assume that each photon has sufficient energy to eject one electron. (Note currents are reported as positive values.)
Describe how would separate a mixture containing benzoic acid and a neutral substance, benzophenone. Both compounds are insoluble in water and solube in ether.
what is the molarity of HCl in a solution prepaired by dissolving 18.25 gm HCl in 200 gm ethanol, if the density of solution is 0.86 gm per mm
The normal boiling point for acetone is 56.5°C. At an elevation of 5300 ft the atmospheric pressure is 630. torr.
A gas chromatogram of the organic components of a sample of beer using a column that separates compounds on the basis of their relative boiling points provides a GLC trace with several peaks. Two of the smaller peaks, with retention times of 9.56 ..
write the equations for two different acid base reactions of diethylamine with water. Indicate the direction of the equlibrium for both reactions. The pKa of diethyl ammonium ion is 10.94.
A stock solution is prepared by adding 25 mL of 2.2 M AlCl3 to enough water to make 75 mL. What is the Cl- concentration of 25 mL of the stock solution.
calculate the amount of energy in kilojoules needed to change 153g of water ice at -10 C to steam at 125 C.
What is the phenomenon that occurs when excited gaseous elements emit only a few colored lines? a. Planck's constant
Niobium (Nb) has a BCC cubic crystal structure, and an atomic radius of 0.144 nm. a) Calculate the edge length (d) of a niobium unit cell:
if a 50.0 liter container holds 45 moles of a gas at a temperature of 200 C what is the pressure inside the container
Calculate the molar enthalpy change when mercury is cooled 10 K. The molar heat capacity of mercury is 27.8 J/K*mol
Perchloric acid with an aqueos solution of ammonia and nitrous acid with lithium hydroxide
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