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A chemistry student dissolved 500 grams of AlCl3 in 2750grams of H2O. The resulting solution had a density of1.015 g/mL. What is the mol fraction of water in the solution described above?
Calculate the equilibrium constant at the temperature for which data is given for each of the following systems atequilibrium.
At 37oC the concentration of Fe3+ insidea cell is 0.082 M and outside is 0.013 M . The cell membrane ispermeable to Fe3+. What potential difference in volts would have to exist across the membrane f
A certain weak acid, HA,has a Ka value of 9.7 x 10 ^-7.Calculate the percent dissociation of HA in a 0.10 Msolution? Calcualte the percent dissociation of HA in a 0.010 Msolution?
Why do you think the solid KIO3 that you will use to make your primary standard will be dried overnight in anoven?
If you assume that the NaOH which you will prepare forstandardization is approximately 0.12 M, calculate the number of moles and the number of grams of H2C2O4*2H2O required to neutralize 25mL of th
The formation of SO3 from SO2 and O2 is an intermediate step in the manufacture of sulfuric acid, and it is also responsible for the acid rain phenomenon. The equilibrium constant Kp for the reactio
50 ml solution of HNO2 is titrated with 0.1 M KOH. It requires 26.4ml KOH to reach the equivalence point of the titration. KA= 4.5x10^-4. What is the intial concentration of the acid HNO2?
A typical root beer contains 0.13% of a 75%H3PO4 solution by mass. How many milligrams of phosphorous are contained in a 12-oz can of this rootbeer? Assume a solution density of 1.00 g/mL, also, 1
Calculate the number of molecules of water in a swimming pool which is 40.0 m in length, 20.0 m in width, and 5.00 m in depth. Assume the density of water is 1.00 g/ cm3.
Calculate the mass of sodium azide (NaN3) needed in theair bag decomposition reaction in order to inflate a 55 literairbag at standard pressure and 20 degrees celsius.
From its known water solubility and density, determine the maximum equilibrium aqueous phase concnetration and the position ina waste drum relative to water of TCE(trichloroethylene) ?
Find the amount of caffeine in milligrams that are isolated per gram of tea leaves. Each tea bag contains 2.3 grams of tea leaves and each tea bag contains 55 milligrams of caffeine.
A common laboratory reaction is the neutralization of an acid with a base. When 60.0 mL of 0.25 M nitric at 24.5 degree C is added to 60.0 mL of 0.275 M NaOH at 24.5 degree C in a coffee cup calorim
Use the electron mass 9*10^-31 kg and h = 10^-34 Js and thelength of the edge of the square to determine the energy levels incm^-1 as a function of the two indicies nx andny for the particle in a sq
A 1.505 g sample of unknown was dissolved in 50 mL of benzene(density = 0.879 g/mL) Solution had melting point of 4.70 degree C.The freezing point of pure benzene is 5.53 degree C and the freezing p
The activation energy Ea is 128.2 kJ/mol for a reaction. Calculate the fraction of collisions that would be energetic enough to react at 346.0 oC.
Applying quantum mechanics to a large molecule, say,hexamethylchicken wire, begins with building theHamiltonian. The larger the molecule, the more terms there will be, of course, but they all fit th
It has been replaced by quantummechanics but, by a remarkable coincidence (not the only one wherethe Coulomb potential is concerned), the energies it predicts agreeexactly with those obtained from t
One suggested design would use a battery of 10 fluidized beds, each 20m long, 4m wide, & containing solids to the depth of 1m.Findthe rate of reaction within the beds , based on oxygenused.
Consider the hypothetical reaction, A + B ® C, with the rate law, Rate =k[A]2[B]. If the concentration of A is increased by afactor of 4 and the concentration of B is increased by a factor of2,
An aqueous solution of 0.150 g of the enzyme lysozymedissolved in 210 ml of solution has an osmotic pressure of 0.953torr at 25 oC. Calculate the molar mass oflysozyme.
The activation energy for the diffusion of atomic species A inmetal B is 125 kJ/mol. Calculate the diffusion coefficient at823°C, given that the value of D at 1200°C is 8.3× 10-12 m2/
Calcium carbonate, the major component of limestone, isslightly soluble in water. Write an equilibrium equation showing the slight solubility of calcium carbonate in water.
A metal bar 122 mm long and having a square cross section with an edge length of 17 mm is pulled in tension with a load of 65000 N, which produces an elongation of 0.12 mm.