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Determine the numbers of mL of the Na For solution should you add to 20 mL of the 0.10 M H For to make your buffer? Formic acid, H For, has a Ka value of1.8*10-4.
Calculate the difference among the standard enthalpy of formation of CO2(g) as currently defined at 1 bar and its value using the former definition at 1 atm?
Demonstrate a full mechanism for the racemization, with a sentence or two between each line explaining the movement of electrons.
Determine the numbers of rings does the original molecule contain? A molecule which has the molecular formula C11H16 undergoes reaction with excess HBr to form C11H18Br2.
A piece of copper metal which is having 36.0 g initially at 100 degree C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20.0 degree C.
Calculate the Ka value measured by the student if the pH of the solution was 2.61? Aspirin (acetylsalicylic acid, C9H8O4) is a weak monoprotic acid. To determine its acid-dissociation const
-56.2kJ/mol. A quantity of 4.00x102 ml of 0.600M HNO3 is mixed with4.00x10 2 ml of 0.300M Ba (OH)2 in a constant -pressure calorimeter of negligible heat capacity. The init
Calculate the empirical and the molecular formulas of the compound. Elemental analysis of 5.000g of a compound showed that it contained 0.318 g of hydrogen, 1.278 g of carbon & the 3.404g of sul
Express the work of isothermal reversible expansion of a van der Waals gas in reduced variables and identify the definition of reduced work that makes the overall expression independent of the ident
Discuss why might one obtain a percent yield less than 100% when reactions will be carried out, copper metal added in the 1st reaction will limit the amount of copper(I) Chloride that forms in
Determine the final temperature (oC) of sample which is having a 28.3 g of copper originally at a temperature of 50.1 oC that has a temperature change of -38.7 oC.
Discuss what velocity must a 20.0 g object be moving to possess a kinetic energy of 1.00J? Demonstrate the formula, what each number means, and how to solve?
At 440 nm the molar absorption coefficient of a solute is 423dm3mol-1cm-1. When the light of that wavelength passes through a 6.50 mm cell containing a solution of the solute, 48.3 percent of the li
Determine the partial pressures of neon and helium after the stopcock is open. The temperature remains at a constant16°C.
Determine the de Broglie wavelength associated with a mount raveling at a velocity of 8.60×105 cm/s? The mount has arrest mass 206.8 times that of an electron.
Does the frequency increase or decrease if centrifugal distortion is considered? Determine the frequency and wave number of the J = 2 ← 1transition in the pure rotational spectrum of12C16O. Th
Determine the maximum non-expansion work per mole that may be obtained from a fuel cell in which the chemical reaction is the combustion of methane at 298K.
Demonstrate a full mechanism for the racemization, with a sentence or two among each line explaining the movement of electrons when optically active 2-methyl-1-phenyl-1-butanone undergoes reaction w
When 5 drops of 0.10 M NaOH were added to 20 mL of the buffer in the previous question, the pH went from 3.39 to 3.42. Write down an ionic equation to explain why the pH did not go up much higher.
Determine the frequency and wavelength of the emitted photon when an electron drops from the n = 4 to the n = 2 level in the Bohr hydrogen atom.
Assuming that the container is totally full that the temperature is 28.9 degrees C, and determine the percent (by volume) of air that would be displaced if all of the liquid nitrogen evaporated when
Aqueous hydrochloric acid reacts with solid lead (II) sulfide to produce dihydrogen sulfide gas and the solid lead (II) chloride? Would it be: PbS(s) = 2H2O...
The p Kb of pyridine is 8.75. Calculate the pH of a 0.145 M solution of pyridine? Pyridine is a weak base that is used in the manufacture of pesticides and the plastic resins.
Compute the conversion energy of C to D via a one-step mechanism. The activation energy of this reaction is 3 kal/mol. The energy distinction among D and the transmission state is 7kcal/mol. Estimat
The initial temperature of both solutions was the same 18.46C. A quantity of 4.00x102 ml of 0.600MHNO3 is mixed with the 4.00x10 2 ml of0.300M Ba (OH)2 in a constant -pressure calo