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The half-life of a reaction, , is the time it takes for the reactant concentration to decrease by half. For example, after one half-life the concentration falls from the initial concentration to , after a second half-life to , after a third half-life to , and so on. on. A certain first-order reaction () has a rate constant of 6.30×10-3 at 45 . How many minutes does it take for the concentration of the reactant, , to drop to 6.25 of the original concentration?
When heated, ammonium carbonate decomposes as follows. NH4CO2NH2(s) -> 2NH3(g)+CO2(g) At a certain temp, the equilibrium pressure of the system is 0.318 atm. Calculate Kp for the reaction.
The addition of S2- ion to Fe(OH)2(s) results in the formation of FeS(s). Explain why the addition of S2- ion to Cr(OH)3(s) does not result in the formation of Cr2S3(s).
The pH at one-half of the equivalence point in a weak acid-strong base titration
experiment beginning with 73.0 mmol isopentyl alcohol, how many grams could you theoretically produce assuming only a 65% attainable yield?
which portion of the titration curve are you in to reach pH = 7? Show your calculations to prove that dilution of 10,000 gal aniline requires 0.58 gal of this acid.
Name three compound types of organic compounds (families) that have the -C=O functional group but not the hydroxyl group.
An aqueous solution containing 34.1 g of an unknown molecular (nonelectrolyte) compound in 141.3 g of water was found to have a freezing point of -1.5 degrees C. Calculate the molar mass of the unknown compound.
the addition of h2 to cc double bonds is an important reaction used in the preparation of margarine from vegetable
A 25.00 mL aliquot of iron solution was titrated to equivalence with 26.19 mL of 0.0215 M KMnO4. A procedure similar to the one in experiment 7 was followed. Calculate the moles of iron in the original volumetric flask.
the rate at which a substance through a semipermeable membrance is determined by the diffusivity D(cm^2/s)of the gas . D varies the membrance temperature
10.08g of potassium chlorate, KClO3 is heated to decomposition according to the following equation. How many grams of O2 gas will be produced?
If it takes 66.8 min for the concentration of a reactant to drop to 20.0% of its initial value in a first-order reaction, what is the rate constant for the reaction in the units min-1?
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