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A "miracle" lotion, which is sold under the label of FixitAll, is a mixture containing both zinc oxide (ZnO) and iron oxide (form unspecified). A 1.4882 gram sample of the dried lotion was dissolved in HCl and diluted to a volume of exactly 286.249 mL. A 10.00 mL aliquot of this reconstituted lotion was treated with an excess of potassium fluoride, which effectively masked the iron in the sample. After adjustment of the pH to a value of 9.4594, it was discovered that 15.2298 mLs of 0.01658 M EDTA was required to titrate the remaining zinc. What is the percent of ZnO in the solid sample derived from the original lotion?
At 25 degrees C and constant pressure, carbon monoxide gas combines with oxygen gas to give carbon dioxide gas with the evolution of 10.1 kJ per gram of carbon monoxide consumed. What is the value of ^H for the balanced reaction?
How many J of heat are necessary to raise the temperature of a 1.05-kg block of iron from 25.0 C to 88.5 C?
You are given a box containing at equilibrium at 1000 K 0.102 moles/liter NH3, 1.03 moles/liter N2, and 1.63 moles/liter H2 for the reaction N2(g) +3 H2(g)-->/
nitroglycerin contains 60 as many carbon atoms as hydrogenatoms three times as many oxygen atoms as nitrogen atoms and
It takes 54.0 J to raise the temperature of an 10.3g piece of unknown metal from 13.0C to 25.0 C. What is the specific heat for the metal?
when deltaG=0; a system is at equilibrium. Use values for delta H standard and delta S standard to determind the temperature
What ratio [CH3NH3+]/[CH3NH2] is needed to prepare a buffer solution with a pH of 8.60 from methylamine, CH3NH2, and methylammonium chloride, CH3NH3Cl? Kb of CH3NH2 = 3.7 10-4.
How many grams of acetylene are produced by adding water to 5.0 grams CaC2
The difference in concentration must be sustained by coupling to reactions that have at least that difference of Gibbs energy
a zero-order reaction has a constant rate of 4.00times10-4 . if after 40.0 seconds the concentration has dropped to
What mass of PbCl2 is formed from mixing 0.334 L of 0.112 molar NaCl with 2.12 L of 0.0343 molar Pb(NO3)2?
What is the de Broglie wavelength of a 145 g baseball traveling at 30.0 m/s (67.1mph)? Is the wavelength much larger or smaller than the diameter of an atom .
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