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Explain what is the minimum number of theoretical plates needed to distilla 1:1 mixture of toluene as well as benzene so that the first drop of distillate is 93 mol % benzene or greater?
a star is estimated to have a mass of 2*10´36 kg. Assuming it to be a sphere of average radius 7 * 10´5 km, calculate the average density of the star in units of grams per cubic centimeter.
A method for measuring organic carbon in seawater consists of oxidation of the organic materials to CO2 with K2S2O8, followed by gravimetric determination of the CO2 trapped by a column of NaOH-coated asbestos.
A voltaic cell is constructed by immersing a strip of silver metal in a 1.0 M AgNO3 solution and a strip of lean in 1.0 M Pb(NO3)2 solution. A wire and salt bridge complete the cell. What is the potential for the cell
what is the emperical formula of a compound that is 17.552% Na, 39.696% Cr, and 42,752% O?
An electron in a hydrogen atom relaxes to the n = 4 level, emitting light of 114 THz. What is the value of n for the level in which the electron originated
Ice has the unusual property of a melting point that is lowered by increasing pressure. if this is the reason we can skate on ice, would a 75-kg skater whose skates contact the ice with an area of 0.1cm^2 be able to skate at -3C
Calculate the concentration of chloride ions in a saturated lead(II) chloride (Ksp = 2.4 ? 10-4) solution.
Draw the Newman projection of all staggered and eclipsed conformations around the C3-C4 bond of hexane (CH3CH2CH2CH2CH2CH3).
The boiling points of HCl and CO2 are nearly the same (-85 degrees C and -78 degrees C). Explain why CO2 can be removed from an aqueous solution by boiling briefly while essentially no HCl is lost even after boiling for one hour or more
Benzoic acid can be extracted from an ether solution using an aqueous solution of sodium bicarbonate.
ammonia gas is produced by reacting hydrogen gas with nitrogen gas. to produce 856 g of ammonia gas using air as your
What mass of Li2SO4 is formed from mixing 24.5 mL of 1.32 molar LiOH with 10.2 mL of 2.43 molar H2SO4
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