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A 0.0450 M solution of para-aminobenzoic acid had an absorbance of 0.844 at 267 nm in a 1.00 cm cuvet, and an absorbance of 0.034 at 240 nm. A 0.0366 M solution of nicotinic acid had absorbances of 0.010 and 0.755 at 267 and 240 nm, respectively. A MIXTURE of PABA and nicotinic acid had absorbances of 0.552 and 0.403 at 267 and 240 nm, respectively. Calculate the concentration of PABA and nicotinic acid in the mixture.
KNO3 was used to construct a salt bridge to all the following solutions: ZnSO4, CuSO4, FeSO4, NI(NO3)2, KI/I2. we then used a multimeter to test voltaages, this is what we came up with for results: Cell Anode Cathod Voltage Assuming that the reduc..
Find the temp (in K) above which a reaction with a delta H of 123.0 kj/mol and a delta S of 90.0 J/k*mol becomes spontaneous.
If the Km of carbonic anhydrase for the above reaction is 1.8 mM, what is the catalytic efficiency of this enzyme under these conditions? The units are s-1M-1.
The solubility of oxygen in lakes high in the Rocky Mountains is affected by the altitude. If the solubility of O2 from the air is 2.67 × 10-4 M at sea level and 25°C.
How many atoms of iron would be needed to react completely with 36 molecules of oxygen. How many molecules of oxygen would be needed to react completely 16 atoms of iron
You are given solutions of HCl and NaOH and must determine their concentrations. You use 27.8 mL of NaOH to titrate 100. mL of HCl and 22.8 mL of NaOH to titrate 50.0 mL of 0.0790 M H2SO4.
How many gm of dry NH4Cl need to be combined to 2.30L of a 0.300M solution of NH3, to prepare a buffer solution of pH 8.85.
The carbon atom model has an additional rotational axis of symmetry that is NOT threefold. Use an arrow to show the location of one of these in a figure of the carbon atom model.
A 0.4168-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.7745 g of CO2 and 0.1586 g of H2O. What is the empirical formula of the compound?
Synthesized a new compound one which has never beenprepared. How would you determine its mp? What precautions could take to insure that it is as accurate as possible?
If you a litre (1000mL) bottle of oil in your engine, how much heat is produced in kcal?In BTU To solve this problem you must know the density of motor oil is .82 g/mL.
Originally, 1.0 mL Hydrochloric acid is added to 1.0g of an unknown amine and 28 mL water in the first step of the Synthesis of Acetamides. If we added 3X the amount of hydrochloric acid instead, why would there be no product?
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