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The molar heat of vaporization of ethanol is 39.9 kJ/mol and the boiling point of ethanol is 78.3°C. Calculate ?S for the vaporization of 0.50 mol ethanol.
A calibrated flask was filled to the 25.00 {\rm mL} mark with ethyl alcohol. By weighing the flask before and after adding the alcohol, it was determined that the flask contained 19.7325 {\rm g} of alcohol
Calculate the inital pH of buffers A, B, & C using the Henderson-Hasselbach equation.
An oxidation-reduction happens in any electrochemical cell; voltaic or electrolytic. (look these terms up in your general chemistry text if you don't remember them.)
Drawa a fat (oil) molecule representing corn oil. The fatty side chains that you need to include are two of the esters group derived from oleic acid and one from the linoleic acid. Draw the structure of this oil clearly with appropriate double bon..
Why must the free-radical polymerization reaction be heated when it is not necessary to heat the ionic polymerization
The wavelength corresponding to the threshold frequency to tungsten surface is 230nm. Calculate the kinetic energy of the photoelectron ejected from the surface of tungsten metal.
Choose the answer which gives the electron-domain geometry and molecular geometry which are both correct for TeF4.
Hydrobromic acid reacts with potassium carbonate to form potassium bromide,carbon dioxide , and water. Barney the incompetent lab tech accidently knocked a flask containing 255ml of 0.500 M hydrobromic acid onto the floor, and now he has to clean ..
A solution is prepared by mixing 75.0 mL of 0.030 M BaCl2 and 250. mL of 0.040 M K2SO4. What are the concentrations of barium and sulfate ions in this solution? Assume only SO42- ions (no HSO4-) are present.
.134 mole of KCl and .212 mole of CaCl2 were dissolved in water, calculate total number of Cl ions in the solution
The 100.0mL sample was treated with a molybdate reagent that precipitates ammonium phosphomolybdate, (NH4)3 [P(Mo12O40)] x 12H2O. This substance was dried at 110 degree C to remove waters of hydration and heated to 400 degree C until it reached a ..
Boron has two stable isotopes with masses of 10.01294 u and 11.00931 u. The average molar mass of boron is 10.81 u. What is the percent abundance of each isotope?
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