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what are the main sources of error in a calorimetry experiement? describe at least three errors.
consider the titration of 25 mL of .25 M NH3 with .05M HBr .What is the pH at the equivalence point?
Explain why the form of the equilibrium constant for a chemical transformation can be predicted from its stoichiometric coefficients whereas
Write the net ionic equation for the reaction. Calculate the equilibrium constant for the reaction.
Aqueous solutions of sodium thiosulfate, Na2SO3, are used as an antidote to some snakebites. How many moles of sodium ions are found in 10.0 mL of a 0.15 M solution of Na2S2O3?
Calculate the pH of a buffer solution that is 0.250 M in HCN and 0.170 M in KCN. For HCN, Ka = 4.9 x 10^-10 (pka = 9.31). Use the equilibirum approach to calculate
Describe the pH of a buffer solution consisting of 100 mL containing 0.1M CH3COOH and 0.125M CH3COO- , both before and after addition of 10 mL of 0.25M HCl. Ka = 1.8 x 10-5.
A 29.0-g sample of water at 270. K is mixed with 48.0 g water at 340. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
when 0.08 moles ammonium chloride are dissolved in enough water to make 677 milliliters of solution, what is the molarity of chloride ions?
Select each of the reactions and observe the reactants taking part in the reactions. Suppose you are carrying out each of these reactions starting with five moles of each reactant. Observe that some reactants are in excess whereas some reactants l..
The equilibrium pressure of H2 over solid uranium and uranium hydride, UH3, at 500 K is 139 Pa. Calculate the standard Gibbs energy of formation of UH3(s) at 500 K.
Hydrogen gas was collected over water in a eudiometer at 26 oC when the atmospheric pressure was 756 mm Hg. What was the pressure of the hydrogen gas?
The temperature of the calorimeter rose from 25C to 33.73C. If the heat capacity of the calorimeter was 9,630 J/C, what is the value of delta H for the combustion reaction in KJ/mol.
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