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The UV spectrum of acetone (c = 0.050 M in cyclohexane, l = 1cm cell) shows ?max at 279 nm with an absorbance of 0.74. What is the molar absorptivity of acetone at this wavelength? (e = A/c*l)
a. 0.068
b. 14.8
c. 0.0027
d. 0.053
at 25.0degc a sample of xe gas occupies 550 ml in a piston-cylider apparatus when the external pressure is 353 torr. at
Draw the lattice direction 101 in a cubic unit cell. Draw the plane in a cubic unit cell with Miller Indices 101.
The pH of a 0.010 mol L-1 solution of a weak monoprotic acid is 2.09 at 25oC. What is the pKa for this acid
What is the pH at the equivalence point when when 40.0 mL of 0.183 mol/L HC7H5O2(aq) is titrated with 0.131 mol/L NaOH(aq)? Assume the temperature is 25oC
A buffer containing 0.42 M base, B, and 0.28 M of its conjugate acid, BH+,has a pH of 8.86. What is the pH after 0.0020mol of HCl is added to 0.25 L of this solution
what will the concentration of all the reactants and products be when the reaction reaches equilibrium at 527 degrees C?
Add 1mg of alcohol dehydrogenase. Assuming all of the ethanol is converted to acetaldehyde, what will the final concentration of NADH be in the solution
Give the number of d-electrons associated with the central metal ion in each of the following complexes: K3[Fe(CN)], [Mn(H2O)6](NO3)2, Na[Ag(CN)2], [Cr(NH3)4Br2]ClO4, [Sr(EDTA)]2-
The bond energies increase in the order: O2^1
If the reaction is begun by adding the catalyst to a flask containing C2H6 at 10.0 bar, what will the partial pressure of C2H4 at equilibrium. Identify three steps the manufacturer can take to increase the yield of the product
The mass of the displaced fluid is equal to the mass of the object in air, 50.0 g, minus the apparent mass of the object in the fluid, 5.6 g: What is the mass of the displaced water
What are some sources of errors that are associated with standardizing a solution/titration, how can these errors be prevented
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