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A digital watch draws 0.20 mA of current provided by a mercury battery, whose net reaction is:
HgO(s) + Zn(s) ZnO(s) + Hg(l)
If a partially used battery contains 1.44 g of each of these four substances, for how many more hours will the watch run? The Faraday constant is 96485 C/mol. (in hours)
One student measure the pH of the following three solution (weak base, conjugate acid and buffer). Using this data, please calculate the pKa and pKb (show calculation).
Calculate the pH during the titration of 20.0 mL of 0.25 M HBr with 0.25 M KOH after 19.90 mL of the base have been added.
Calculate the molarity of a NaOH solution if 35.42 mL of this NaOH solution is required to titrate 0.7566 g of KHP, KC6H4(COO-)(COOH).
Determine what was the % of excess air used? If The reactant entered at 93 degrees Celsius and
Question- How many grams of potassium periodate, KIO4, must be mixed with 175.7 g of water to produce a 0.1309 molal solution?
100.0 ml of 0.100 M acetic acid is placed in a flask and is titrated with 0.100 M sodium hydroxide. An appropriate indicator is used. Ka for acetic acit is 1.7 x 10^-5. Calculate the pH in the flask at the following points in the titration.
A bicycle tire is filled with air to a pressure of 95.0 psi at a temperature of 19 degrees celcius. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees celcius. The volume of the tire increases by 4.0%. What..
benzene c6h6 and toluene c6h5ch3 form ideal solutions. at 35degc the vapor pressure of benzene is 160. torr and that of
isotonic saline solution which has the same osomotic pressure as blood can be prepared by dissolving 0.923 of in enough
Would the change in enthalpy of a neutralization rxn involving weak acid as well as strong base be greater or less that of a rxn between a strong acid and strong base. WHY
What is the minimum number of microwave photons with a wavelength of 3.07 mm that will have to be absorbed by a 126.00 gram sample of water to heat it from 25°C to 100°C?
if you start with 5.5 grams of lithium chloride, how many grams of calcium chloride will be produced? mg+2naf=mgf2+2na
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