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Derive the activation energy for the reaction that has a rate constant of 3.5 x 10^-5 s-1 at 25C and the rate constant of 4.8 x 10^-4 s-1 at 45C.
calculate the energy absorbed when 2.67 moles of ethyl ether undergo combustion: CH3CH2OCH2CH3(l) + 6O2(g)-> 4CO2(g)+5H2O(l) delta H=+1604 kJ/mol
The concentration of the first ion to precipitate (either Al3+ or Ca2+) decreases as its precipitate forms. What is the concentration of the this ion when the second ion begins to precipitate?
At 760 K, 15% of a sample of cyclopropane changes to propene in 6.8 min. What is the half-life of cyclopropane at 760 K?
The (-) enantiomer of a compound has a specific rotation [a]= -86 degrees. A sample of this pure enantiomer, when measured in a two dm sample tube, gives an observed rotation
What one reagent should re-energize the light solution after it has faded? Explain using moles and limiting reagents.
explain why ethanamine (ethylamine) initially forms a white precipitate when added to a solution of aqueous copper sulphate (CuSO4).
If 1.50g (NH4)2SO4 is dissolved in enough water to form 250 ml of solution, what is the molarity of the solution.
A 4.50-g sample of LiCl at 25.0 C dissolves in 25.0 mL of water also at 25 C. The final equilibrium temperature of the resulting solution is 60.8 C.
Carbonated cola is more acidic than coffee or even orange juice because cola contains phosphoric acid. What is the molar concentration of H3O^+ in a cola that has a pH of 3.120
The following compound has two stereoisomers. One has a dipole of 0 D, and the other has a dipole moment of 2.95 D. Draw the structure of the stereoisomer with dipole moment of 0 D.
Determine the absolute error and relative error in ppm CaCO3 associated with a single standardization and titration of an unknown CaCO3 solution
BNCT relies on the initial targeting of tumor cells by an appropriate chemical compound tagged with 10 5 B , which preferentially concentrates in tumor cells.
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