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Problem- Calculate the pH of a .250 M solution of Hydrocyanic Acid (HCN). The Ka of HCN is 4.9x10^-10 at 25 Celcius
State the steps included in computation of pH
Three pure compounds are formed when 1.00-{\rm g} samples of element X combine with, respectively, 0.472 {\rm g}, 0.630 g, and 0.789 g of element {\rm Z}. The first compound has the formula {\rm{X}}_2 {\rm{Z}}_3.
When C2H5OH +3O2 produces 2CO2 + 3H2O,determine how many grams of oxygen gas are essential for complete combustion of 421grams of ethanol ?
When crystals of D-fructose are dissolved in basic aqueous solution, two aldohexoses are obtained. Propose the structures for the aldohexoses.
for the reaction a b-----gt c the rate law is rateka. if the initial concentration of a 2.5 moll the initial b 1.4
The molar heat of reaction, H rxn, for the reaction of Ca(s) + 2H+(aq) Ca2+(aq) + H2(g)
When X rays of wavelength 0.093 nm are diffracted by a metallic crystal, the angle of first-order diffraction (n = 1) is measured to be 15.2 degrees;. What is the distance between the layers of atoms responsible for the diffraction?
The standard change in free energy at 122oC is -6.001 kJ for the reaction A(s) + 2 B(g) ? AB2(g) We prepare a mixture at 122oC in a sealed 3.020 L vessel to contain 0.0370 mol A, 0.509 atm B, and 0.344 atm AB2. What is the free energy change (kJ) ..
Determine the pH at the equivalence (stoichiometric) point in the titration of 31.4 mL of 0.899 M HF by 0.886 M NaOH. The Ka of HF is 3.5 x 10^-4.
Sodium bicarbonate and sodium carbonate dissolved in water use to make buffer solution. The Ka value of carbonic acid is 4.37 x 10^-7 and sodium carbonate is 4.68 x 10^-11.
a 9.36-g piece of platinum is heated to 98.6 degc in a boiling water bath and then dropped onto ice when the metals
1.00 mole of an ideal gas (Cv,m=12.47 J mol-1 K-1) is initially at 300 K and in 10 L and is expanded to 20 L in two different ways described below. Compute w, q, deltaU, delta S, and delta S total for both of these two processes.
Draw a graph that shows the relative energy of the conformer as a function of the torsional angle. Make sure that you clearly label which conformer corresponds to which position on the graph.
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