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At the endpoint of a titration of a weak acid HA (nicotinic acid) with NaOH (100 mL each, 0.100 M), the pH is 8.78. What is the apparent Ka of the acid?
Cv and Cp denote the molar specific heat capacities of a gas at constant volume and constant pressure, respectively. Then (A) Cp âˆ' Cv is larger for a diatomic ideal gas than for a monoatomic ideal gas.
Write the structures for all the aldol condensation products you expect from the cross aldol condensation of 4-methyl benzaldehyde and 2-butanone (methyl ethyl ketone)
The student then titrates the oxalic acid solution with her sodium hydroxide solution. When the titration reaches the equivalence point, the student finds she has used 0.1265 L of sodium hydroxide solution. Calculate the molarity of the student's ..
Calculate the mole ratio of iron used to copper produced. Express this ratio as a simple whole-number ratio.
What is the wavelength (in nm) of the line in the spectrum of the hydrogen atom that arises from the transition of the electron from the orbital with n =3 to the orbital
How many moles of O2 are required for the complete combustion of 2.2 g of C3H8 to form CO2 and H2O?
A solution of ethylene glycol and water has a boiling point of 109.8 degrees celcius. What is the freezing point. (Kf H2o=1.86 degrees celcius/m; Kb H20=0.52 degrees celcius/m)
Molecular weight and mole concept explained in this solution, The molecular weight of NaOH is 40. the molecular weight of a widely used buffer, HEPES, is 255
Pure copper may be produced by the reaction of copper(I) sulfide with oxygen gas as follows: Cu2S(s) + O2(g) ? 2Cu(s) + SO2(g) If 0.330 kg of copper(I) sulfide reacts with excess oxygen, what mass of copper metal may be produced
What amount of energy is required to completely ionize 29.9 grams of carbon atoms in the gas phase (C(g)) if the ionization energy of C(g) is 1086 kJ/mole.
Calculate ?Sºf for oxalic acid and ?Sº for the combustion of one mole of oxalic acid. c) Calculate ?Gºf for oxalic acid and ?Gº for the combustion of one mole of oxalic acid.
What is the maximum fermenter diameter that can support heat removal from a culture growing at 16 degrees Celcius with an oxygen uptake rate (OUR) of 200 mM/L/hr when cooling water
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