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the standard enthalpy and entropy for a slightly soluble salt at 25 degrees c were determined to be 71 kj and 49 jk
what is the wavelength in nanometers of a photon with a frequency of 560 multiplied by 1014 sec-1 the speed of light in
a titration was performed at 25 degrees c and the ksp of a slighlty soluble salt was determined to be 15times10-4
what is the ph of a solution that contains 015 m hc2h3o2 and 028 m c2h3o2- use kb 56 x 10-10 for c2h3o2- ph
given a stationary phase of silica gel and nonpolar and polar analyte which would elute first also if given a polar
a carboxylic acid can exist in two conformations e and z that are different by the dihedral angle around the c-o bond
how many grams of sodium formate nacho2 would have to be dissolved in 14 l of 042 m formic acid pka 374 to make the
what advantages does liquid chromatography have over tlc and what advantages does liquid chromatography
what is the ph of a solution prepared by mixing exactly 561 ml of 0200 m hc2h3o2 with 149 ml of 0400 m koh ka for
in thin layer chromatography tlc what does the rf retention factor value represent what is a large rf value telling us
a c-h bond absorbs at 2950 cm-1 replacing the 12c with 14c has a smaller effect on the position than replacing the 1h
write four equations showing structures for the reactions used in this experiment to separate and recover
a 420-m column has a height equivalent to a theoretical plate of 070 mm if the flow rate is 325 mlmiddotmin-1 calculate
what two properties of gold make it possible to find gold but not metals like copper silver lead and aluminum by
what length of column is necessary to produce a resolution of 10 between two solute peaks the distribution coefficients
arrange the following atoms according to decreasing effective nuclear charge experienced by their valence elctrons cl
when ice melts it absorbs 033 kj per gram how much ice is required to cool a 100 oz drink from 72 degrees celsius to 39
agci are insoluble in water what can we conclude if anything regarding the energy required for separating and energy
a cook wants to heat 124 kg of water from 250 degrees celsius to 1000 degrees celsius if he uses the combustion of
under what conditions can an electron be boosted to a higher energy level ie to an electron shell further from the
a 380 ml sample of 150 m kbr and a 610 ml sample of 0630 m kbr are mixed the solution is then heated to evaporate water
if you had excess aluminum how many moles of aluminum chloride could be produced from 280 grams of chlorine
a certain metal crystallizes in a body-centered cubic arrangement the edge of the cube is 564 a and has a density of
how many grams of dry nh4cl need to be added to 150 l of a 0500 m solution of ammonia nh3to prepare a buffer solution
the standard enthalpy of formation of nh3g is -460 kjmol calculate the thermal energy evolved when 80g of h2g react