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If air is composed of 21% oxygen and 79% nitrogen at 1 bar could be separated into its pure components, each at 1 bar and the same temperature. what is the entropy change per mole of air?
What went wrong in a column chromatography of a 50:50 mixture of acetylferrocene + ferrocene, if the recovery percentage values for each compund recovered (acetylferrocene and ferrocene) are above
How many moles of N2 are dissolved in 5.00L of water if the water is in equilibrium with air at 5.84 atm (approximately the hydrostatic pressure at a depth of 50m) at 37°C?
A Solution of hexane and heptane at 30.0C with a mole fraction of .305 has a vapor pressure of 95.0 torr and a vapor-phase hexane mole fraction of .555.
Give an example of how you would take a primary alcohol to an aldehyde, what reagents would you use? How would you take a primary alcohol to a carboxylic acid?
Treatment of an alkyl chloride C4H9CL with strong base gives a mixture of three isomeric alkene products. What is the structure of the alkyl chloride, and what are the structures of the three produ
A 1.00-L gas sample at 100.°C and 613 torr contains 50.0% helium and 50.0% xenon by mass. What are the partial pressures of the individual gases?
What is the percent composition of a mixture of (S)-(+)-2-butanol,[µ]D25 = +13.52º, and (R)-(-)-2-butanol,[µ]D25 = -13.52º, with a specific rotation [µ]D25 = +6.76º
It takes 208.4 kJ of energy to remove 1 mole of electrons an atom on the surface of rubidium metal. How much energy does it take to remove a single electron from an atom on the surface of solid rubi
Gout is caused by an error in nucleic acid metabolism that leads to a buildup of uric acid in body fluids, which is deposited as slightly soluble sodium urate (C5H3N4O3Na) in the soft tissues of joi
Uncle Wilbur let me watch as he analyzed the iron content of runoff from his banana ranch. A 25.0-mL sample was acidified with nitric acid and treated with excess KSCN to form a red complex. (KSCN i
If a open-tube manometer contains a non volatile silicone oil (density=1.30 g/cm3 instead of mercury (13.6 g/cm3), what are the pressures in the flask of the manometer as show, in torr atmospheres,
How much isopropanol and how much water will you use to make 20 mL of a 40% isopropanol/ water solution? How much isopropanol and how much water will you use to make 20 mL of a 60% isopropanol/wate
An argon ion laser puts out 5.6 of continuous power at a wavelength of 532 . The diameter of the laser beam is 6.0 . If the laser is pointed toward a pinhole with a diameter of 1.1 , how many photon
Calculate the melting point of ice under a pressure of 10 MPa. Assume that the density of ice under these conditions is approximately 0.915gcm-3 and that liquid water is 0.998 g cm-3.
The Km of an enzyme of an enzyme-catalyzed reaction is 6.5 M. What substrate concentration will be required to obtain 55% of Vmax for this enzyme?
If you are told that the purity of compound Z is 87% and the reported value for its molar extinction coefficient is 9200 M -1 cm -1 at 605 nm. What should you measure as the e of this impure compou
On a cold, dry morning after a frost, the temperature was -5C and the partial pressure of water in the atmosphere fell to 0.30 kPa. Will the frost sublime? What partial pressure of water would ensu
Consider separate 1.0-l samples of He(g) and UF6(g), both at 1.00 atm and containing the same number of moles. What ratio of temperatures for the two samples would produce the same root mean square
Explain with revelant mechanism why sec-butly alcohol loses its optical activity in sulfuric acid, but retains its optical activity indefinitely in aqueous base?
One way to judge the accuracy of your calorimeter is to compare the results for a known system. Examine you % error of specific heat of Aluminum. What does this indicate about the accuracy of your
The wall of a flask is periodically rinsed with the previously boiled, deionized water from the wash bottle. How does this titrimetric technique affect the reported percent acetic acid in the vinega
The electron affinity of each group 5A elements is more positive than that of each corresponding group 4A element. Use the electron configuration of the valence electrons for these columns to sugge
Calculate the effect on the chemical potentials of an increase in pressure of 1.0 bar on the liquid and solid phases of carbon dioxide which are in equilibrium. Relevant densities are 2.35 g/cm^3 a
Determine the limiting reactant when 114.0g of Fe2O3 (molar mass = 159.69 g/mol) are reacted with 56.8 g of CO (molar mass = 28.01 g/mol)?