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In calibrating a drop counter, a student had an initial buret reading of 0.41 mL and a final buret reading of 4.71 mL after dispensing 75 drops from a buret.
The first three reactions of the b oxidation pathway are similar to three reactions in the Kreb's cycle. Which three and why are they similar
The student found that 8.67mL of NaOH solution was needed to titrate a 0.0544g sample of the acid to the equivalence point. Calculate the mass of unknown required for a 30.0mL titration.
A 0.1293 g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 1769 J/°C. The calorimeter contains exactly 261 g of water, and the temperature i
Calculate the heats of combustion for the following reactions from the standard enthalpies of formation listed in Appendix 3. (?H°f (HgO(s)) = -90.7 kJ/mol and ?H°f (FeO(s)) = -272 kJ/mol.)
Methanol, ethanol, and n-propanol are three common alcohols. When 5.00 g of each of these alcohols is burned in air, heat is liberated. Calculate the heats of combustion of these alcohols in kJ/mol.
At equilibrium the concentration of NO in the vessel is 0.161M. At equilibrium the vessel contains N2, H2O and H2. What is the value of the equilibrium constant Kc for the following reactions
In solving weak acid equilibrium problems to find [H+] or pH, a major assumption is usually made. This major assumption can be represented by the following
what is the mechanism showing electron flow with curvy arrows that includes all steps and intermediates going from starting materials to TPCP, the starting materials are dibenzyl ketone (1,3-dipheny
This converts the nitrogen in the protein to ammonia. The NH3 that formed was distilled and collected into flask containing 50.00mL of .09552 M HCL. The resulting solution was then back titrated, re
What are the odds of finding a particle in a one dimensional box between 0 and L/2, that is L is the length of the box. Assume that the particle is in the second to lowest energy level (n = 2).
The Delta G for the freezing of H2O(l) at -10 Celsius is -210 J/mol and the heat of fusion of ice at this temperature is 5610J/mol
When 2.45g of an unknown weak acid (HA) with a molar mass of 85.0g/mol is dissolved in 250.0g of water, the freezing point of the resulting solution is -0.258 degrees C.
A 15.0- mL sample of 0.100 Ba(OH)2 is titrated with 0.125 M HCl. Calculate the pH for at least five different points throughout the titration curve and make a sketch of the curve.
A student has analyzed several 1 nL volume samples of a 10-12 M solution. What is the expected precision due to Poisson statistics
(FW 180.16 g/mol) is burned in a calorimeter whose heat capacity is 29.7 kJ/oK, the temperature increases by 2.635oK. Calculate the heat of combustion of fructose in kJ per mole.
Using the value of Ksp for Ag2S, Ka1 and Ka2 for H2s, and Kf=1.1x10 to the fifth for AgCl2, calculate the equilibrium constant for the following reaction:
When MCl4(NH3)2 is dissolved in water and treated with AgNO3, 2 moles of AgCl precipitate immediately for each mole of MCl4(NH3)2. Whats the coordination number of M in the complex?
suppose a saturated solution of Barium Flouride contains 1.47*10^-2 M F-. What is the Ksp of the BaF2?
Aqueous solutions of nickel(II) sulfate and mercury(I) nitrate react to give aqueous nickel(II) nitrate and a mercury(I) sulfate precipitate
calculate the pH of a 1.06 x 10^-2 M solution of decongestant ephedrine hydrochloride if the pKb of its conjugate bas is 3.86
What is delta G for the transfer of 6 mol K+from blood plasma to the cellular fluid at body temperature(37C). What is the minimum amount of work that must be used to transfer this K+
Decane has 4.5 min retention time on HP-1 column (25 m length, 0.25 mm I.D., 0.33 mkm film thickness) at 120C. Calculate the capacity factor for decane on HP-1 column (25 m length, 0.25 mm I.D., 0.5
A concentration cell is constructed which contains two Ni(s)-Ni2+(aq) half cells. The first half cell has [Ni2+] = 1.35 M, and the second half-cell has [Ni2+] = 3.75 x 10^-4 M. Which half cell is th
Although his product was a white solid, it melted over a broad temperature range that was much lower than the melting point of vanillyl alcohol. His instructor suggested washing the product with dil