For the following reaction, Kc = 255 at 1000 K.
CO (g) + Cl2 (g) ? COCl2 (g)

A reaction mixture initially contains a COconcentration of 0.1490 M and a Cl2concentration of 0.177 M at 1000 K.

What is the equilibrium concentration of CO at 1000 K?

What is the equilibrium concentration of Cl2 at 1000 K?

What is the equilibrium concentration of COCl2 at 1000 K?

Predict whether capsaicin is more soluble in oil or in water. What consequences does this have for cooking with chili peppers?

As a technician in a large pharmaceutical research firm, you need to produce 400. mL of 1.00 M a phosphate buffer solution of pH = 7.08. The pKa of H2PO4−  is 7.21. You have 2.00 LL of 1.00 M KH2PO4 solution and 1.50 L of 1.00 M K2HPO4 solution, as well as a carboy of pure distilled H2O. How much 1.00 M KH2PO4 will you need to make this solution?

what is the correct name of the glycosidic bond in maltose?

All of these problems involve preparation and use of a vaccine solution that contains an active agent in an aqueous solution. The active agent in the vaccine degrades in aqueous solutions with first-order kinetics. The half-life of the active agent in water 25o C is 8.4 hours. The vaccine should be administered at a concentration of at least 20 μg/L to be fully effective.

1. Calculate the rate constant, k1, at 25o C. Be sure to include the units.

2. Suppose a stock solution of the vaccine with a concentration of 25 μg/L is prepared in a clinic at 8:30 am. The clinic plans to store this solution at 25o C and use it for all of the patients that are seen for morning appointments between 9:00 am – 12:00 noon. Is this a good practice? Justify your answer. Will the vaccine be effective for all of these patients? If not, at what time will the concentration of the active agent fall below the effective level?

3. The half-life of the active agent is measured at 4o C and found to be 11.5 hours. What is the activation energy for the degradation reaction?

4. A stock solution of the vaccine is prepared at 8:30 am and stored in a refrigerator at 4o C. It will be used for all of the patients with morning appointments between 9:00 am – 12:00 noon. However, the last patient of the morning was delayed and did not arrive until 12:30 pm. What is the concentration of the active agent in the stock solution at that time? Can the vaccine still be used?

0.80 grams of KHP is titrated with 20 mL of the unknown NaOH solution. What is the molarity of the NaOH solution in mol/mL?

The pKa of the α-carboxyl group of phenylalanine is 1.83, and the pKa of its α-amino group is is 9.13. Calculate the average net charge on phenylalanine if it is in a solution that has a pH of 8.20 (If the charge is positive, you do not need to enter a \" \" sign.)

2. Look up a coffee-cup calorimeter in your textbook and describe the components of the apparatus. (2 points) Assuming that the calorimeter prevents any heat to be taken in or released, the amount of heat transferred between the system and the surroundings should be equal in value but opposite in sign. For example, if a hot piece of metal gives off 5 J of energy, than the surrounding water should take in 5 J of energy. (Remember exothermic processes have a “-“q while endothermic process have a “+” q).

q_system = - q_surroundings

With that being said, the transfer of heat during a chemical reaction can be concluded as

q_system (aka the reaction) = - q_surroundings (aka the solution)

and since we know that…

q = C x m x DT

we can conclude that…

c_rxn x m_rxn x DT_rxn= - (c_soln x m_soln x DT_soln)

(note that the “-“ sign is just to show that they are equal but opposite. The actual value of the rxn and solution depend on the reaction that took place)

Aniline hydrochloride, [C6H5NH3]Cl, is a weak acid. Its conjugate base is the weak base aniline, C6H5NH2. Ka = 2.40 X 10-5. Calculate pH at points if 50 mL of .100 aniline hydrochloride is titrated with .185 M NaOH Calculate the pH (a)before titration begins (b)at E.P (c) at the midpoint (d) after 20 mL of NaOH (e) after 30 mL of NaOH

A beaker with 115mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 4.70mL of a 0.470MHCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740.

calculate the solubility in g/l of AgBr in (a) pure water and (b) 0.0066 M NaBr. (in scientific notation)

Assume the Pacific Ocean has a surface area of 1.7 x 108 km2 and an average depth of 3800 m.
Calculate the volume of water in the ocean in liters:

please explain and label the signals of ethylbenzene c6h14o proton nmr and IR. thank you..

1. Describe the role of the citric acid cycle as a central metabolic mechanism. Explain what happens to the cells' abilities to oxidize acetyl CoA when intermediates of the cycle are drained off for amino acid biosynthesis.

2. Describe the three steps in photosynthesis, detailing the interrelationships among them. (c.f. the discussion in the online classroom).

Ka for HCN is 4.9×10−10 and Kb for NH3 is 1.8×10−5, calculate Kb for CN− and Ka for NH4+. Enter the Kb value for CN− followed by the Ka value for NH4+, separated by a comma, using two significant figures.