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A hydrochloric acid solution contains 28.0% HCl by mass. What mass of this solution should be used to completely dissolve 6.75 g Al in the reaction below? 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g)
What is the PH of a 100 mM solution of PIPES if the pKa is 6.76? What is the PH of a 250 M solution of TRIS if the pKa is 8.08? A 100 mM solution of a weak organic acid has a PH of 3.6, What is the pKa of the acid?
Question- The standard free energy change for the formation of two moles of H?O in a strong acid-strong base neutralization reaction at 25 degrees Celsius is -79.9kJ. a) Calculate the equilibrium constant.
Supercooled (metastable) water vapor commonly occurs in the atmosphere if dust particles are not present to begin condensation of the liquid.Sometimes small particles,such as tiny crystals of silver iodide
Why does it take significantly stronger magnetic and electric field strengths to move the beam of alpha particles compared with the beam of electrons (beta particles)
How many grams of sodium formate, NaCHO2, would have to be dissolved in 1.2 L of 0.13 M formic acid (pKa 3.74) to make the solution a buffer for pH 3.61
The Ksp of magnesium phosphate at a given temperature is 9.78 x 10-17. Calculate the molar solubility at this temperature.
The rate law for the reaction 3A ? 2B is rate = k[A] with a rate constant of 0.0447 hr-1. What is the half- life of the reaction
Predict the order of elution for the silica gel adsorption TLC separation of the mixture containing benzyl alcohol, benzaldehyde, and benzoic acid using methylene chloride solvent. Explain
The equation for a Beer's Law plot is y = 2012.5x + 0.003. If the recorded absorbance for an equilibrium mixture is 0.362, what is the concentration of FeCNS2+ (aq)?
An empty 100-mL measuring cylinder weighs 132.456 g. When filled with rice to the 100-mL mark it weighs 220.345 g. After water has been added to fill the spaces between the grains, the weight is 250.123 g. What is the density of the rice in g m..
r-134a is throttled from 1200kpa and 40oc to 200kpa. it is known that heat of 5kjkg is lost from r-134a to the
Many esters have characteristic odors (usually pleasant). Methyl salicylate (ester) can be prepared from salicyclic acid and methanol via Fischer Esterfication.
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