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Problem- 1) Determine the activation energy (EA, in kJ/mol) of a reaction for which the rate triples upon a temperature increase from 39oC to 50oC.
2) 7 volts is applied across a 1 meter length of silver filament. The filament diameter is 48 microns and the resistivity of silver is 1.59 x 10^-8 ohm-m. Calculate the current that will flow through the filament. Express your answer in amps.
3) The charge carrier density of GaAs at 26oC is 2.25x106 cm-3. What is the charge carrier density (in cm-3) at 176oC? The bandgap of GaAs is 1.42 eV.
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a metal object with a mass of 19g is heated to 96 degrees C, then transferred to a calorimeter containing 75 g of water at 18 degrees C. The water and metal object reach a final temperature of 22 degree C.
A graph of ln (K) versus 1/T for this reaction gives a straight line with a slope of 1.341X10^4 K and a y-intercept of -14.37. Determine the values of ΔH° and ΔS° for this reaction
a 2.40-g sample of a large biomolecule was dissolved in 12.0 g of carbon tetrachloride. the boiling point of this
A common by-product in this reaction is biphenyl, which is generated through a coupling reaction of phenylmagnesium bromide with unreacted bromobenzene. Draw the structure of biphenyl.
The solid state transition of Sn(gray) to Sn(white) is in equilibrium at 18 C and 1atm, with an entropy change of 8.8 J/kmol. The density of gray tin is 5.75 grams/cm3 that of white tin is 7.28 g/cm3. Compute the transition temperature at a pressu..
Determine the percent yield if An 8.50 grams sample of Ammonia gives 12.0 g of Nitric Oxide?
The absorbance at 595 nm was 0.78 and,according to a standard curve, corresponds to 0.015 mg of proteinon the x axis. What is the protein concentration of the original solution?
if a 2.5 l reaction vessel initially contains 725 torr of cyclopropane at 485c how long will it take for the partial
How many centimeters does light travel in 5.00 years (given that the velocity of light is 3.00 \times 10^{10} {\rm cm}/{\rm s})? Express your answer with the appropriate units.
For a copper zinc cell of sulfate concentration 1M the potential is see to be 1.10 volts. Calculate the potential of the cell at room temperature if the concentrate of zinc sulfate is 1.2 M and the concentrate of copper sulfate is 0.0012 M.
The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later
a beaker with 115 of an acetic acid buffer with a ph of 5.00 is sitting on a benchtop. the total molarity of acid and
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