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A compound with a molecular mass of 287.29 was dissolved in a 5 mL volumetric flask. A 1.00 mL aliquot was withdrawn, placed in a 10 mL volumetric flask, and diluted to the mark. The absorbance at 340 nm was 0.427 in a 1.000 cm cuvet. The molar absorptivity for this compound at 340 nm is = 6130 M-1 cm-1. (a) Calculate the concentration of compound in the cuvet. (answer in M) (b) What was the concentration of compound in the 5 mL flask? (answer in M) (c) How many milligrams of compound were used to make the 5 mL solution? (answer in M) (Please show HOW you got the answers too)
Given equilibrium pressure, calculate Kp, When heated, ammonium carbonate decomposes as follows. NH4CO2NH2(s) f/r2NH3(g)+CO2(g)
cube of a silver-colored metal with a volume of 64 cm3 has a mass of 672 g. The density of pure silver is 10.5 g/cm3. Is the metal pure silver?
The pH of a bicarbonate-carbonic acid buffer is 6.95. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-)
The volume of a manifold used to transfer gases is calibrated using Boyle's Law. A 0.251-dm3 flask at pressure of 697 Torr is attached and after system pumpdown,
What relationship exists between H+ ion concentration and OH- ion concentration? What is the OH- concentration in an aqueous solution where the H+
Enough of a monoprotic acid is dissolved in water to produce a 0.0193 M solution. The pH of the resulting solution is 6.31. Calculate the Ka for the acid.
Using condensed electron configurations and Lewis electron-dot symbols to depict the monatomic ions formed from each of the following reactants, predict the formula of the compound the ions produce. N and Mg
A key oxidative step(s) in the B-oxidation cycle of fatty acids includes: a. addition of water to a double bond b. generation of a double bond from two adjacent -CH2 carbons
A 0.451 M solution of a weak acid, HA, has a pH of 4.01. Calculate Ka for the acid. Use E notation and 3 significant figures.
What will the partition function of this system reduce to at very low temp ( when kbt > delta e)?
an electron is confined to a linear region with a length of the same orderas the diameter of an atom (about 100 pm)
Using a sample of 0.0355 gram of an unknown molecular compound is dissolved in 1.000 g of liquid camphor at 200.0°C. Calculate the molar mass of the unknown compound if the camphor freezes at 157.7°C upon cooling.
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