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The pK MSelect one:a. 0.20 Mb. 0.050 Mc. 0.15 Md. 0.35 Me. 0.26 M aof a weak acid was determined to be 3.39 by measuring the pH of a solution containing the weak acid at 0.20 and its conjugate base. The measured pH was 3.27. What was the concentration of the conjugate base?
the thermal decomposition of n2o5 obeys first-order kinetics. at 45 degrees celcius a plot of lnn2o5 versus t gives a
PET has a permeability to carbon dioxide of 0.227x10^-13(cm^3 x cm)/(cm^2 x s x Pa) at 25 C. Given that the activation energy for permeability is 27 kJ/mole, at what temperature would the permeability be ten times higher
What is the percent ionization of a 0.0300 M aqueous solution of cyanic acid, HCNO (Ka = 3.5E-4)?
Two 20.0g ice cube at -10 C are place into 275 C of water at 25.0 C. Explain what is the final temperature of the water after all the ice melts
The boiling point of a liquid increases as the pressure above the liquid increases. In contrast to boiling food in an open pot, pressure cookers trap the steam, which raises the internal pressure, which raises the boiling point of water, causing a..
Give structural formulas( condensedor bond-line)for all of the different alkenes that can be hydrogenated with H2/pt to produce 3-methylheptane.
How much energy (in kilojoules) is needed to heat 3.20 of ice from -14.5 C to 23.5 C? The heat of fusion of water is 6.01, KJ/Mol and the molar heat capacity is 36.6 J/
A compound is 80.0% carbon and 20.0% hydrogen by mass. Assume a 100.- sample of this compound. How many grams of each element are in this sample
What is the molarity of an HCl solution if 22.3 mL of the solution is required to react with 0.266g of Na2CO3?
What is the typical solution used to alkalize cocoa? Why (for what purpose) is cocoa alkalized? What is the typical pH of cocoa powder, and then what is the pH after alkalization?
The combustion of carbon with excess oxygen forming carbon dioxide is exothermic. C(s) + O2(g) => CO2(g) ?Hrxn = -393 kJ If 9,494kJ of heat is needed from the combustion
a. What is the concentration of the diluted DNA? b. What is the concentration of the undiluted DNA?
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