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Problem- A p-type Si is doped with NA acceptors close to the valence band edge. A certain type of donor impurity whose energy level is located at the intrinsic level is to be added to the semiconductor to obtain perfect compensation. If we assume that simple Fermi-level statistics apply, what is the concentration of donors required? Furthermore, after adding the donor impurity, what is the total number of ionized impurities if the above sample is perfect compensation?
I need proficient help to explain each and every step in detail of the above problems.
A 25.0 mL sample of unknown hydrochloric acid solution is titrated with 0.100 M NaOH. The equivalence point was reached after the addition of 23.5 mL NaOH. Find the concentration of the unknown HCl(aq).
A 44 sample of water absorbs 329 of heat If the water was initially at 21.7, what is its final temperature.
Calculate the amount of solution (g or mL) that contains each of the following amounts of solute. Express your answer to 3 significant figures and include the appropriate units.
The Radio signals from Zog reveal that balloonium is a monatomic gas with two positive nuclear charges. Use the data to assume the names that Earthlings give to these elements
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A. In determining the percent acetic acid in vinegar, the mass of each vinegar sample is measured rather than volume. Explain.
A solution is 9.60%(w/w) and contains 25.0 gm of salt. How much water is in the solution, and what would be a reasonable estimate of volume of solution
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Calculate the molar solubility of calcium oxalate, CaC2O4, in a solution that has been buffered so that the pH is constant and equal to 4.00. The solubility product for calcum oxalate is 1.7 x 10-9.
Question- Lanthanum-139 is a stable nuclide but lanthanum-140 is unstable (t1/2 = 40 hr). What rule of thumb involving nuclear stability is involved
Using the Boltzmann distribution, calculate the ratio of electrons at the bottom of the conduction band to those at the top of the valence band for pure Si at 300.K. The Si band gap is 1.1 eV. The answer to this question has to equal 3.35 x 10-18.
Calculate the pH of a mixture of .25M acetic acid and .1M sodium acetate. The pKa of acetic acid is 4.76.
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