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A solution of a specific vitamin has ?max = 251nm and a concentration of 4.79x10^-7M. The absorbance of the solution at 251 nm is A = 0.175. What is the molar absorptivity of the vitamin at 251nm? (sample pathlength = 1.00cm)
what is the aluminum ion, Al3+, concentration if the cell potential is 0.447 V and the manganese (II) ion concentration is 0.10 M?
Calculate [H+] and the pH of the following solutions.
Benzene and biphenyl are typical by-produdcts of these grignard reactions. Give mechanisms for their formation. IR would not be of much use in differentiating these two byproducts
At a certain temperature, reaction has equilibrium constant (Kc) of 1.9 x10^19. Determine the equlibrium constant for the reaction based on this information at the same temperature.
Calculate the enthalpy change in kJ when 21.6g of H2S is burned. 2H2S(g) + 3O2(g) --> 2SO2(g) + 2H20(g) Change in H=-1036kJ/mol
A container with a removable partition contains gas A and gas B. Gas A is at 400K and 10.0 atm and gas B is at 400K and 4.00 atm. The partition is removed and the gases mix
Write the reactions for the preparation of the diaonuim salt for the coupling of the salt with the sodium salt of 2-napthol. 2. Write the reaction of the sodium salt of para red when treated with 1 M H2SO4. Why does a precipitate form?
If the total pressure in the flasks is 311 torr after the stopcock is opened, determine the initial pressure of N2 in the 1.00 L flask.
A buffer that contains 1.10 M base, B, and 0.700 M of its conjugate acid, BH+, has a pH of 9.250. What is the pH after 0.0050 mol of HCl
Consider the unbalanced equation: C5H12(l) +O2(g) --> CO2(g) +H2O(l) if 25.2 grams of pentane (C5H12) are burned in excess oxygen, how many grams of H2O will be produced?
Draw the structure of the product that would be formed from allowing a-e to react with excess hydrogen gas in the presence of a nickel catalyst.
During the chlorination of drinking water and wastewater, what is it that makes chlorine an effective microbiocide?
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