5) Answer the following questions regarding a solution of benzene and toluene that exhibits ideal behavior. By showing your detailed calculations, determine each of the following: A) What will be the composition in terms of mole percentages of a benzene-toluene solution that has a vapor pressure of 280 torr at 60 C? At 60 C, Pbenzene = 300 torr; and Ptoluene = 100 torr. (4 pts) B)What will be the partial pressures in torr of the two components in the solution at 60 C? (2 pts) C)What will be the composition of the vapor at 60 C? Report the composition in terms of mole percentages. (3 pts)
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How do you determine the mass needed to make a certain molarity and certain pH solution? For example, if I need to make 300 mL of 0.05 M Tris Base and 0.05 M NaCL (pH 8.2) from 2M of both, how do I do the math for that and get the grams needed of each?
Also how do you use the Henderson-Haseelbach equation to determine how much .1 M KH2PO4 to add to 100 mL of of K2HPO4 to give a pH of 7.0 (pKa = 6.86).
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Calculate the molar solubility of AgI in a 1.0M NH3 solution (Step by step)
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a 1.015-g sample of KHP (204.23 g/mol) is dissolved in water and tirated with 24.55 mL of NaOH solution to a phenolphthalein endpoint. Calculate the molarity of the NaOH solution.
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part A: Given the two reactions
H2S⇌HS−+H+, K1 = 9.64×10−8, and
HS−⇌S2−+H+, K2 = 1.53×10−19,
what is the equilibrium constant Kfinal for the following reaction?
S2−+2H+⇌H2S
part B:Given the two reactions
PbCl2⇌Pb2++2Cl−, K3 = 1.83×10−10, and
AgCl⇌Ag++Cl−, K4 = 1.12×10−4,
what is the equilibrium constant Kfinal for the following reaction?
PbCl2+2Ag+⇌2AgCl+Pb2+
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The photoelectric work function of potassium is 2.3eV. If light with wavelength 250nm falls on potassium find (a) the stopping potential in volts. (b) the kinetic energy in eV of the most energetic electron ejected (c)the speed of these electrons (d)If potassium is replaced with Aluminium, which has a greater work function (4.3eV), compute the change in the threshold frequency.
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4.)Sketch a potential energy diagram for the endothermic, elementary reaction
A + B à C + D
and on it denote the activation energies, heat of reaction.Also indicate the reactants, products transition state.
5.)Explain collision theory?
6.)Explain why all reactions have an activation energy, using your knowledge of collision theory
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1. Calculate the concentration of the lactate ion in a solution that is 0.100 M in lactic acid (CH3CH(OH)COOH, pKa = 3.86) and 0.080 M in HCl.
2. For the generic equilibrium HA(aq) ⇌ H+(aq) + A−(aq), which of these statements is true?
| If you add the soluble salt KA to a solution of HA that is at equilibrium, the pH would increase. | |
| If you add the soluble salt KA to a solution of HA that is at equilibrium, the concentration of A− would decrease. | |
| The equilibrium constant for this reaction changes as the pH changes. | |
| If you add the soluble salt KA to a solution of HA that is at equilibrium, the concentration of HA would decrease. |
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What in ideal mixture? How does it differ from an ideal gas mixture? What about an ideal-dilute solution?
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I mix together 50.0 mL of 0.100 M NaIO3, 50.00 mL of 0.100 M NaOH, and 10.0 mL of 0.100 M HIO3. What is the pH of the mixture?
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1. How does temperature affect solubility of salicylic acid based on your results?
2. Explain how you used Beer
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How do you find the rate constant here?
| trials | [I] | [H2O2] | [H] | temp (C) | Rate (M/s) |
| 1 | 8.53*10^-3 | 1.03*10^-1 | 0.333 | 21.5 | 5.33*10^-4 |
| 2 | 8.53*10^-3 | 1.03*10^-1 | 0.333 | 15 | 4.3*10^-4 |
| 3 | 8.53*10^-3 | 1.03*10^-1 | 0.333 | 42 | 2.17*10^-3 |
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|
Identify the oxidizing agent and the reducing agent in the
following: answer is
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||
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How many grams of oxygen does it take to burn 16.8 g of glucose?
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