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Explain what is the ph of .39M trimethylammonium bromide, (CH3)3NHBr? The Kb of trimethylamine, (CH3)3N, is 6.3 x 10-5.
An aqueous solution containing 35.5 g of an unknown molecular (nonelectrolyte) compound in 156.3 g of water was found to have a freezing point of -1.4C. calculate molar mass of unknown compound
Calculate the initial rate of a first-order reaction if the concentration of reactant is 0.63 M and the half-life is 6.9 s
A sample of the weak base hydroxylamine is titrated with 0.0900 M HCl. 30.0 mL is required to reach the endpoint. After the addition of 10.0 mL of titrant, the pH is 6.26. Calculate the pKb of hydroxylamine
Spica has a surface temperture of 23kK (2.3 x 10^4 K). At what wavelength does Spica emit the maximum intensity of light?
Briefly comment on the differences in these two concentrations. calculate the [OH] in a 1.0M NaOH solution and in a buffer containing 1.0 M NH3 and 1.0 M NH4Cl.
How many mL of 0.50 M sodium acetate must be added to 20mL of 0.20 M acetic acid to yield a buffer of PH 4.20?
Explain what mechanistic rationale can account for the formation of this (these) product(s)? Explain what can be done experimentally to ensure that all of the stilbene is used up in the reaction that is it is the limiting reactant
what are the ground state electron configuration of the elements in period 2 of this alternate reality?
Converting between Units of Pressure Gases are different from solids and liquids. In a sample of gas, the molecules are far apart. The gas molecules also move around and collide with each other as well as with the walls of the container. These col..
A student weighed 0.0961 g of calcium carbonate (FW: 100.08 g/mol) into a 100-mL volumetric flask, dissolved the powder using nitric acid, and diluted to the mark with 0.2% nitric acid.
A mixture of pentane and hexane has a vapor pressure of 258 torr. The standard vapor pressure of pentane is 425 torr. What is the mole fraction of pentane?
Construct a neat and compact table, including title and footnotes if required, to summarise the following information taken from rough notes
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