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A semiconductor of n-type is know to have an electron concentration of 3 x 1018 m-3. If the electron drift velocity is 100 m/s in an electric field of 500 V/m, calculate the conductivity of this material.
A solution contains 1 x 10-3 M Fe2+ and 2 x 10-10 M Fe3+. As the pH of the solution is raised, which iron hydroxide will precipitate first (i.e., ferrous hydroxide, Fe(OH)2(s) or ferric hydroxide, Fe(OH)3(s)). At what pH will this occur?
A quantity of HI was sealed in a tube, heated to 425C, and held at this temperature until equilibrium is reached. The concentration of HI in the tube at equilibrium was found to be 0.0706 moles/liter
A 100.0-L flask contains a mixture of NO2 gas and CO gas. If the concentration of NO2 is 5.5 × 105 ppm, and the total pressure is 790 torr, what is the partial pressure of CO in the flask?
Describe in brief the risk connected with solutions of 1M NH 3 , 1M HCl, and 1M NaOH?
What fraction of the spherical atomic volume is occupied by the nucleus? What fraction of this atom's mass is contributed by its nucleus?
How many grams of oxygen (O2) are needed to completely react with 2.40 g of propane (C3H8) according to the equation below?
how many Liters of water can be made from 34 grams of oxygen gas and 6 grams of hydrogen gas at STP? what is the limiting reactant for this reaction?
A 10.00 ml solution of zn^2+ of unknown concentration was mixed with 25.00 mL test reagent (a known excess) and diluted to a final total volume of 200 ml to produce a colored solution having an Absorbance of 0.104 at a certain wavelength.
Which of these sublevels may be utilized in constructing a partial orbital diagram for a period 3 element
A certain first-order reaction () has a rate constant of 6.90×10-3 at 45 . How many minutes does it take for the concentration of the reactant, , to drop to 6.25 of the original concentration?
Air coming from a painting operation contains 10.0 wt% acetone. The total flow rate of the air/acetone stream is 1.00x103 lbm/min. This stream is sent to a scrubbing system where it is mixed with water.
A 270- flask contains pure helium at a pressure of 755 . A second flask with a volume of 485 contains pure argon at a pressure of 727 torr.
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