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The following data were obtained from experiments to find the molecular formula of procaine, a local anesthetic, which contains only carbon, hydrogen, nitrogen, and oxygen. Complete combustion of a 3.54 g sample of procaine with excess O2 formed 8.58 g CO2 and 2.70 g H2O . Another sample of mass 2.35g of procaine was found to contain 0.279 g of N. The molar mass of procaine was found to be 236. Find the molar formula of procaine.
You make 1.00 L of a buffered solution (pH = 4.00) by mixing acetic acid and sodium acetate. You have 1.00 M solutions of each component of the buffered solution. What volume of each solution do you mix to make such a buffered solution
Calculate the expected pH values of the buffer systems from the experiments (a, b, c, d) using the Henderson-Hasselbalch equation (pH= pKa + log [A-] ). Use for pKa values: carbonic acid= 6.37 and acetic acid= 4.75.
Write a balanced molecular equation for the overall reaction, using the smallest whole number coefficients, including the states of matter for each reactant and product.
Calculate the following when 0.250 L of 0.250 M AgNO3 solution is mixed with 0.350 L of 0.300 M Na2CO3 solution. Ksp for Ag2CO3 is 8.46E-12. What mass of ppt forms and what concentration of Ag+ is left
the density of pure silver is 10.5 gcm3 at 20degc. if 6.17 g of pure silver pellets is added to a graduated cylinder
An aqueous solution of lead nitrate, Pb(NO3)2, is mixed with one of sodium cromate, Na2CrO4, resulting in the formation of a percipitate of lead chromate.
The molar absorptivity for compound A is 739 at wavelength 1 and 461 at wavelength 2. The molar absorptivity for compound B is 319 at wavelength 1 and 266 aw wavelength 2.
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.
to recrystallize a solid the solvent used must dissolve very little solid when cold and a lot of solid when hot.
Given the reactants and products, write balanced net ionic equations fr the following reactions.
What masses of sodium chloride,magnesium chloride, sodium sulfate,calcium sulfate, calcium chloride, potassium chloride, and sodium bicarbonate are needed to produce 1 L of arificial seawater
A solution gave a precipitate when ammonium oxalate was added but gave no precipitate when ammonium sulfate was added. For each Magnesium group ion(Barium, Magnesium, Strontium, and Calcium) tell whether the ion
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