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determine a polymer with a number average molecular weight of 6200 daltons the polymer is made of two different
state the structure of n-9 protonated caffeine with a charge on the nitrogen however an examination of the charge data
explain what is the molarity of an hcl solution whose density is 113gcm3 as well as that contains 257 hcl
the ka value for acetic acid ch3coohaq is 18x10-5 compute the ph of a 280 m acetic acid solution compute the ph of the
while an excess of al2o3 is added to 174ml of 270m h2so4 452g al2 so43 are isolated explain what is the yield define
a sample of an unknown biochemical compound is found to have a percent composition of 5901 carbon 715 hydrogen 765
if 25g of al 270gmol as well as 72g of fe2o3 1598gmol are placed in a reaction vessel under proper conditions explain
prepare 250 ml of 02 m phosphate buffer in which h2po4- hpo4 compute the volume of 2m phosphoric acid and 1m naoh
a hydrocarbon with molecular formula c13h20 is chiral as well as has a structure such that one of its give sp3
explain why should apparatus always be clamped securely to a metal ring stand before starting a chemical
the subsequent four numbers are estimates of the mass of an object- 430 g 582 g 579 g and 547 g explain what is the
illustrate a detailed curved arrow mechanism for the acid-catalyzed acetylation of an alcohol roh using acetic
explain how do reaction rates typically depend on temperature explain what part of the rate law is temperature
state the heat of vaporization of water is 4066 kjmol explain how much heat is absorbed when 198 g of water boils at
compute the amount of heat needed to completely sublime 960g of solid dry ice co2 at its sublimation temperature if the
hydrogen and oxygen react vigorously to form water if 120 hydrogen molecules are reacted with 200 oxygen molecules in a
specified that the enthalpy of combustion of graphite is -3935kjmol as well as that of diamond is -39541 kjmol compute
compute the work of expansion in joules accompanying the complete combustion of 10 g of sucrose to carbon dioxide and a
if the molar concentration of sodium carbonate na2co3 is 25 mm millimolar explain what is the mass concentration of
find out the concentrations of mgcl2 mg2 and cl- in a solution prepared by dissolving 168 times 10-4 g mgcl2 in 250 l
a 513g sample of a solid containing ni is dissolved in 200ml water a 500ml aliquot of this solution is diluted to
explain how much dry solute would you take to prepare each of the subsequent solutions from the dry solute and the
if a 20l container was charged with 0807atm of xe gas as well as 137atm of fluorine gas at 400c the xenon gas reacts
will a precipitate of feoh3 form when 1000 ml of 050 m feno33 is added to 5000 ml of 20 m nacn ka 7 x 10-10 for
explain how many hertz downfield from the tms would be the signal occurring at 20ppm in a 300-mhz spectrometer and a