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A 2.00 g sample of a large bio molecule was dissolved in 15.0 g of carbon tetrachloride. The boiling point of this solution was determined be 77.85C. Compute the molar mass of the bio molecule. For carbon tetrachloride, the boiling point constant is 5.03C.kg/mol. and the boiling point of pure carbon tetrachloride is76.50C.
what experimental variables must be controlled to assure reproducible absorbance data
Calculate the pH of the titration mixture after 10.0, 20.0 and 30.0 mL of base have been added. (the ka for acetic acid is 1.76 x 10^-5).
Polly Esther determined the Ca2+ ion content of a 100 mL sample of calcium fortified orange juice. After adding 2.0 M HCl solution to the sample, she filtered the juice to remove the pulp and other particulate matter
How much heat energy is evolved or absorbed 8kg of Ca(OH)2 reacts with a stoichiometric amount of CO2 Delta(H) = -69.8 kJ/mol
What are the percentages of each molecular ion? (List to nearest 1% in order of increasing mass separated by commas, e.g. 55,45.)
Super-green is an indicator with a Ka of 1.6 × 10-7. The acid form is yellow and the base form is blue. Awesome-orange is an indicator with a Ka of 5.0 × 10-5.
moist air exerts lower pressure and dry air exerts high pressure. how would the volume of the hydrogen gas that was ollectes been different if this eperiment was done on a very rainy day/ on a very dry day?
the standard free energy change for the reaction of nitrogen gas with hydrogen gas to produce ammonia is -32.9 kj.
which term in the nswer for part c resists compression? Which term resists stretching? sketch a graph of f(R) at three different temperatures. Does it require more or less force to stretch the polymer as the temp increases?
The pressure of the vapor of the unknown liquid in this experiment was taken to be equal to the atmospheric pressure in the laboratory. why?
What is the pH at the equivalence point of a weak base-strong acid titration if 20.00 mL of NaOCl requires 28.30 mL of 0.50 M HCl? Ka = 3.0 × 10-8 for HOCl.
When an amino acid is dissolved in a buffer solution, the pH of which is less than the isoelectric point of that amino acid, and an electric current is passed through the solution
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