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1. The mass percentage of chloride ion in a 25.00-mL sample of seawater was determined by titrating the sample with silver nitrate, precipitating silver chloride. It took 42.58 mL of 0.2997 M silver nitrate solution to reach the equivalence point in the titration What is the mass percentage of chloride ion in the seawater if its density is 1.025 g/mL
2. The arsenic in a 1.22-g sample of a pesticide was converted to AsO43- by suitable chemical treatment. It was then titrated using Ag+ to form Ag3AsO4 as a precipitate.
(a) What is the oxidation state of As in AsO43- ?
(b) Name Ag3AsO4 by analogy to the corresponding compound containing phosphorus in place of arsenic.
(c) If it took 25.0 mL of 0.102 M Ag+ to reach the equivalence point in this titration, what is the mass percentage of arsenic in the pesticide?
Calculate the number of ATP molecules that are produced from the biological oxidation of one molecule of each of the following to CO2 and H2O
An organic compound was prepared and purified by chromatography. A conductivity measurement showed the compound to be a nonelectrolyte. Elemental analysis gave an empirical formula of CH3O.
0.00334 moles (total) of NaOH were added to an aspirin solution. 0.000884 moles of HCl were required to back titrate the excess NaOH to a colorless endpoint. Explain how many moles of aspirin are in the sample
a gas occupies a volume of 458 ml at a pressure of 1.01kpa abd temperature of 295 k. when the pressure is changed the
A covalent compound is composed of a nitrogen atom, a hydrogen atom, and a carbon atom. How many electrons should the Lewis structure of the covalent compound contain
question the heat of vaporization of ccl2f2 is 289 jg.what mass of this substance must evaporate in order to freeze
The glutamate and ammonia reaction can couple with the hydrolysis of ATP (such as shown above). What is delta G ran and K for this coupled reaction
A cube has a volume of 8.0cm (to the 3rd power) and a mass of 21.6 grams. The density of the cube, in grams per cubic centimeter, is best expressed as
How many mmoles of HCl do you add every time you added 500ul of 2M HCl to the .25M tris solution. how many mmole sof HCldo you add each time you added 500 ul of .2M HCl to 25mM tris solution
What is the specific heat capacity of a liquid if 450.0 kJ of heat caused 230.0 g of the liquid if temperature changed from 25°C to 28°C and state the reaction exothermic or endothermic
How should the reaction be tamed out to produce 100 kmol of C per day - Raw mataials are pure A and B. Undesired co-products also farmed include BO and BA.
50mL of 0.1M aqueous solution of some organic compound was brought in contact with 7mL of octanol at 20oC. After equilibration GC analysis of octanol phase shows component concentration of 0.4M. Explain what is the portioning coefficient of this c..
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