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Calculate the pH during the titration of 20.0 mL of 0.25 M HBr with 0.25 M KOH after 19.90 mL of the base have been added.
a lake in central texas contains 5.0 billiion liters of water. the pH is normally 6.4, but it is tested at 5.6. how much CaCO3 should be added to bring the pH to a more reasonable 6.0?
When light of frequency 1.30x 1015 s-1 shines on the surface of cesium metal, electrons are ejected with a maximum kinetic energy of 5.2x 10-19 J. Calculate the wavelength of this light in nm.
Which of the following is both a decomposition reaction and a reduction-oxidation reaction? a. H2CO3(aq) --> Co2(g) + H2O(l) b. Zn(s) + SuNO3(aq) --> Cu(s) + ZnNO3 (aq) c. Ca(OH)2(aq) + 2HCl(aq) --> CaCl2(aq) + 2H2O(l)
Consider following cell. SCE stands for the saturated calomel reference electrode, which has a fixed potential of 0.244 volt. Pt|VOSO4 (0.0184 M), V2(SO4)3 (0.212 M), HClO4 (0.0100 M) || SCE Calculate the cell potential.
change in heat content we write h hfinal - hinitial or for chemical reactions h hproducts - hreactants given this
Using the values for the heat of fusion, specific heat of water, and or heat vaporization, calculate the amount of heat energy in each of the following
Amino acids with an additional COOH group in the side chain are called acidic amino acids.
If two reactions sum to an overall reaction, and the equilibrium constants for the two reactions are and , what is the equilibrium constant for the overall reaction
If you have unknown sample which either benzoic acid or 2-naphthol, describe a method to determine the identity of the unknown compund.
A sample of vanadium haveing 5.67 grams of mass upon heating combined with oxegen of 4.45gramsto make vanadium oxide. Determine the emperical formula for this compound?
In the reaction below, how many liters of CO2 gas are produced from the combustion of 55.0 L of CH4 gas?
Calculate the magnitude of the current in amperes if the number of moles of hydrogen gas produced is 5.99×10?4 .
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