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If the activation energy of a unimolecular reaction is 63kj mol-1, what fraction of the reactant molecules have sufficent energy to react at 9 degrees C? what fraction of the reactant molecules hav
A fishing boat accidentally spills 15 barrels of diesel oil into the ocean. Each barrel contains 42 gallons. If the oil film on the ocean is 2.5 × 102 nm thick, how many square meters will th
If 26.8 grams of lithium hydroxide is mixed with 250ml of water to form a solution which is then reacted with boron fluoride, how many grams of each product will be formed?
Suppose that the microwave radiation has a wavelength of 12.4 cm. How many photons are required to heat 275 mL of coffee from 25.0 celsius to 62.0 Celsius?
The original volume is 50. cm3. If the combustion of this mixture releases 1383. J of energy, to what volume will the gases expand against a constant pressure of 655. torr if all the energy of combu
A gas has a volume of 2.8 L at a temperature of 27 degrees celsius. What temperature (degrees Celsius) is needed to expand the volume to 15 L ? (P and n are constant.)
Element X, a member of group 5A, forms two chlorides, XCl3 and XCl5. Reaction of an excess of Cl2 with 8.729g of XCl3 yields 13.233g of XCl5. What is the atomic mass and identity of the element X?
How many grams of sodium lactate should be added to 1.00 L of 0.160 M lactic acid to form a buffer solution with pH = 4.10? Assume that no volume change occurs when the sodium lactate is added.
The hydrogen gas formed in a chemical reaction is collected over water at 30 degrees celsius and a total pressure of 732 mmHg.
Twenty dietary iron tablets with a total mass of 22.131 g were ground and mixed thoroughly. Then 2.998 g of the powder was dissolved in concentrated HNO3 and heated to convert all the iron to Fe3+.
Upon quenching the steel from 950 degree Celsius to 50 degree Celsius what phases will be present what will be the composition?
At the top of a building the barometric pressure reads 730 mm Hg, at the bottom of the building the barometric pressure reds 755 mm Hg. considering density of mercury to be 13600 kg/m^3, and densit
Calculate the concentration of ClO^ - at equilibrium if the initial concentration of HClO is 7.5×10^-3 M.Calculate the concentration of HClO at equilibrium if the initial concentration of HClO
Copper crystallizes in a face-centered cubic lattice. If the density of metallic copper is 8.96 g/cm^3, what is the radius of the copper atom?
Draw all possible contributing structures to the carbocation intermediate in the bromination of phenol. Why would the major products be o- and p-bromophenol?
If acetic acid is the only acid that vinegar contains Ka = 1.8 x 10^- 5, calculate the concentration of acetic acid in the vinegar. The pH is 3.15.
Explain how dimer, tetramer, or other oligomeric versions of quarternary protein structure can be energetically favorable. After all, everything in nature tends to go to a state of disorder.
Magnesium deficiency is a common problem in the United States. Magnesium salts (e.g. Magnesium chloride) are more bioavailable than are magnesium oxide or magnesium hydroxide, which are commonly fou
For a steel furnace, silica refractories have corrosion rates of 2E-7 m/s at 1,345OC and 9E-7 m/s at 1,510OC. Calculate the activation energy for the corrosion of these silica refractories.
The coinage metals-copper, silver, and gold-crystallize in a face center cubic structure. Use the density of copper of 8.95 g/cm^3 to calculate the atomic radius of copper.
What is the minimum frequency of light necessary to emit electrons from sodium via the photoelectric effect? What is the wavelength of this light?
The mass of a crucible and hydrated salt was found to be 21.447 g. The mass of the crucible and the anhydrous salt was 20.070 g. The mass of the crucible was 17.985 g. Calculate the mass of the hyd
A venturi meter measures the flow of water at 65 degrees F in a 34 inch inside diameter pipe. The meter has an 18 inch throat. A different pressure of 3.2 in Hg is determined.
A typical diver inhales 0.500 L of air per breath and carries a 20 L breathing tank containing air at a pressure of 300 bar. As she dives deeper, the pressure increases by 1 bar for every 10.08 m.
A 1.00 mL sample of dilute acetic acid required 23.4 mL of 0.10 M sodium hydroxide solution to titrate the sample to a phenolphthalein endpoint (which is assumed to be close in pH to the equivalence