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Determine the dissociation constant of the acid? 50.0 mL of a solution containing the 3.0 m mol of a weak acid are found to have a pH of 5.64.
At what pH will this solution contain equalcon centrations of OAc and HOAc? Consider a 0.100 M solution of acetic acid, HOAc (Ka =1.8x10-5).
In aqueous solution, the hydrogen sulfate ionHSO4-, dissociates according to the Explain how might sodium hydrogen sulfate be used to prepare a buffer solution?
If the final temperature is 23.5 degree C, what was the unknown volume? (Assume that no heat is lost to the surroundings; d of water = 1.00g/mL) An unknown volume of water at 18.2 degree C.
Explain how much heat in kJ is formed by the reaction of 3.48 mol of carbon dioxide? Consider the reaction, 2C4H10(g) +13O2(g) ---> 8CO2(g) +10H2O(l), for which ΔH = -5760kJ.
Using Maxwell's relation, calculate whether the entropy of silicone increases, decreases, or stays the same when it is compressed by increasing the P at constant T. Silicone is a biomaterial that e
Discuss how much 0.100 M NaOH must be added to 45.0 mL of 0.100 M HOAc (ka for acetic acid = 1.8x10-5) to give a solution whose pH is 4.30?
Determine the concentration of sodium acetate [Na(CH3COO)] formed at the equivalence point when 25.0mL of 0.0750 M acetic acid (CH3COOH) are titrated with0.0300 M NaOH.
Write down all the equilibrium expressions for all the steps of this dissociation. Determine the pH and the concentration of H2PO4^- , HPO4 ^-2 and PO4^3- ions for a 9.0M H3PO4 solution.
Determine the final temperature observed in a coffee cup calorimeter when the 12.50g of calcium hydroxide is totally dissolved in the 125.0g of water initially at the 21.5o C.
When one more of H2O(g) is condensed to one mole of H2O(l) at 1.00 atm and100.oC, 40.66 kJ of heat is released. One mole of H2O (g) at 1.00 atm and 100.oC occupies a volume of 30.6L.
At STP a balloon filled with the 1.00 mole of helium gas is heated to 298 K at the constant pressure. Determine the change in the internal energy. (cHe= 5.20 J/g
Determine the heat change when a system consisting of a 5.50kg iron ball at the 37.0 degree C. is placed in a large reservoir of water at17 degree C.
What would be the product of the reaction by using the solubility rules, would you expect there to be a reaction between NaCl and CaCl2?
Determine the minimum amount of heat that must be dissipated to the environment when one ton of air is separated into the nitrogen (21% by mole) and oxygen (79% by mole).
The corresponding third-law standard entropies are 69.95J/mol and 188.835 J/mol at the same temperature. The standard enthalpies of formation (at 298K) of liquid and gaseous phases of water are -241
Would both rings have approximately the same value? Fully explain your reasons. Which ring, cyclopentene or cyclobutene, would you expect to have the greatest heat of hydrogenation per m
Determine the wavelength of the light emitted when a hydrogen atom electron returns to the n=1 level from n= 5? ( first determine the energy difference)
Determine the partition function of the electronic states at 2000 K. Determine the relative population of each level at 2000K. A certain atom has a triply degenerated ground level, anon-degenerated
At what temperature will 15 percent of the molecule be in the upper state? A certain molecule has a doubly degenerated excited state lying at 360 cm-1 above the non-degenerated ground state.
When the population of the upper state is one-half that of the lower state, determine the temperature of a two-level system of energy separation equivalent to 300 cm-1
Determine the frequency separation of the nuclear spin levels of a14N nucleus in a magnetic field of 14.4T given that themagnetogyric ratio is1.93x10+7T-1s-1.
Discuss the possible orientations of the angular momentum in terms of the angle it makes with the z-axis? For a 14N nucleus, determine the magnitudes of the spin angular momentum and its allowed
Calculate the length of the edge of a unit cell, the radius of a copper atom is 90.2pm, if the copper crystallizes in the face-centered cubic lattice.
Excess trioxide needed the .22ml of 0.07609M NaS2O3. Identify the weight percent of ascorbic acid (FM 176.13) in the unknown.