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How long does it take to electroplate 0.5 mm of gold on an object with a surface area of 31 cm2 from an Au3+(aq) solution with a 8 A current? Recall the density of gold is 19.3 g/cm3.
Determine the molar mass of the acid and given that the pH at the half way point to the equivalence is 3.86. Calculate the Ka of the unknown acid.
Calculate the molarity of a solution made by dissolving 0.650 grams of Na2SO4 in enough water to form exactly 880 mL of solution.
A half-cell, made by dipping a silver wire into 0.05 M aqueous AgNO, at 298 OK, develops a half-cell potential of +0.740 volts. What is the standard half-cell (Eo) for silver?
nitrogen gas reacts with oxygen gas to form nitrogen monoxide gas. How many total electrons are transferred from each molecule of nitrogen or oxygen
How many grams of Mg(NO3)2 (Mm=147 g/mol) must be added to 405 g of water to make a solution with a colligative molality of 0.125 m?
solution of H3PO4 and you want to completely react it with KOH. How many ml of a .462 M KOH solution do you need to accomplish this? How many grams of the two products do you produce?
134 mole of KCl and .167 mole of CaCl2 were dissolved in water. What is the total number of Cl ions in the solution?
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.240 M HClO(aq) with 0.240 M KOH(aq). The ionization constant for HClO can be found here (4.0×10-8).
At constant pressure, in which of the reactions is work done by the system on the surroundings? By the surroundings on the system? In which of them is no work done?
When 0.062 moles of ammonium sulfate ((NH4)2SO4) are dissolved in enough water to make 200 milliliters of solution, how many ammonium ions are present.
A gas occupies a volume of 449 mL at 12.9°C and 737 mm Hg pressure. Calculate the volume the gas would occupy at STP.
If aqueous acetone (80% acetone, 20% h2o) is used as the extraction solvent instead of 100% acetone, the extraction yields of chlorophyll a and beta carotene
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