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Descrbe the pH of a buffer soluton consisting of 100mL containing 0.1M CH3COOH and 0.125 CH3COO-, both before and after the additon of 10mL of 0.25M HCl. a= 1.8x10^-5.
Calculate the minimum energy a photon must have to produce an electron hole pair in an extrinsic semiconductor of band gap 1.0 electron volts.
What are the molality and mole fraction of solute in a 36.3 percent by mass aqueous solution of formic acid (CH3OH)?
A mixture was prepared with the following initial concentrations: [CO] =0.20M, [H2O] = 0.30 M. No formic acid, HCHO2, was initially present. What was the equilibrium concentration of HCHO2?
What is the energy of a C-C bond in kJ/mole? Explain. How does this amount of energy compare?
You have a 48.9 g sample of water at the temperature of -60.0 degrees celcius. How much energy is required to: a) heat the ice to 0 degrees celcius
The vapor pressure of carbon tetrachloride, , is 0.354 atm and the vapor pressure of chloroform, is 0.526 atm at 316K . A solution is prepared from equal masses of these two compounds at this temperature
25.0 cm3 of a saturated solution of Ca(OH)2 required 21.0 cm3 of 0.0500 mol dm-3 HCl for complete neutralisation. Calculate the [OH-(aq)] and the [Ca2+(aq)] in the saturated solution.
A stock solution of perchloric acid is 70.5% by mass HClO4 and 29.5% by mass water. The density of the solution is 1.67 g·mL-1 at 20 C. Calculate the molarity of the solution.
What is the main structural feature of the azo dyes that causes them to be colored compounds?
Require to apply to neutralize the acidity that concluded from nitrification and determine how much CaCO 3
Consider the cell prepared with 2.0 M Cd2+ and 0.45 M Zn2+ solutions: Zn(s) + Cd2+(aq) --- Zn2+(aq) + Cd(s)
Use the de Broglie relationship to determine the wavelengths of the following objects: an lithium atom moving at 2.5*10^5m/sUsing Heisenberg's uncertainty principle,
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