This is set of homogeneous and gas phase reactions: A-->B-->C . The reaction scheme is carried out in a constant volume, ideal batch reactor at constant temperature. The first reaction is first order with respect to A with a rate constant k1 while the second reaction is zero order with a rate constant k2. Initially, the reactor contains only A at a concentration CA0. a) Derive expressions for the concentration of A, B, and C as a function of reaction time t

b) If k1 = 0.5 h−1, k2 = 3 mol/m3·h, and CA0 = 30 mol/m3, find the optimal time to reach a maximum yield of the desired product B, where yield is defined as YB/A = CB/CA0. What is the corresponding value of the maximum yield at this point in time? What constraints (if any) need to be placed on k1, k2, and/or CA0 in order to observe a maximum in the yield?

1) Why is the resistivity of the filter cake (the solid) higher than resistivity of filtrate, for after doing the filtration drilling fluids?

2) Should drilling fluids be high in resistivity or low? and why?

An adult inhales approximately 12 times per minute, taking in about 500 mL of air with each inhalation. Oxygen and carbon dioxide are exchanged in the lungs, but there is essentially no exchange of nitrogen. The exhaled air has a mole fraction of nitrogen of 0.75 and is saturated with water vapor at body temperature, 37°C. If ambient conditions Professor Christina Tang, [email protected] 2 are 25°C, 1 atm and 50% relative humidity, determine what volume of liquid water (mL) would have to be consumed over a two hour period to replace the water loss from breathing.

(a) How much water would have to be consumed on an airplane where the temperature, pressure and relative humidity are 25°C, 1atm and 10%, respectively.

1. Describe a medical or biomedical problem that has been diagnosed treated by nano science. Answer what, who, where, how and when they made the discovery.

2. Indicate how you experimentally verify or demonstrate the special properties of diamond compared to the properties of graphite and coal?

Are all liquid crystal polymers? What are thermotropic and lyotropic liquid crystals? What is the difference between nematic, smectic and cholesteric liquid crystals? Are those three the only possible liquid crystal phases?

What are four reasons that BOD5 is tested at a WWTP?

Three candidates showed up for an interview. Of all the candidates, only one was appropriated for the job. The first candidate arrived promptly and was dressed professionally. She spoke articulately and seemed a good fit for the organization. The next candidate was also on time, but his dress shirt was stained, his tie was crocked, and he seemed to struggle with the standard interview questions. His performance during the interview was not as impressive as the first candidate’s performance. The final candidate, dressed T-shirt and ripped jeans, arrived a full hour past the scheduled interview time. Because of her tardiness did not interview her.

Q1. Which of the following inferences can the reader draw according to the passage?

A. Preparing for a job interview can compensate for inappropriate business attire

B. A wide variety of applicants for this position ensure the company will find a good candidate

C. Tardiness for a job interview will be interpreted as laziness and disorganization.

D. Being on time for a job interview and dressing appropriately is important to securing.

Q2. Which of the following sentences from the passage is a fact?

A. Because of her tardiness, we did not interview her.

B. Of all the candidates, only one was appropriate for the job

C. His performance during the interview was not as impressive as the first candidate

D. She spoke articulately and seemed a good fit for the organization.

Q3. Which of the following is the writer’s purpose for writing this passage?

A. To change

B. To stereotype

C. To explain

D. To analyze

Specify the number of degrees of freedom for the following alloys:

(a) 95 wt% Ag–5 wt% Cu at 780°C

(b) 80 wt% Ni–20 wt% Cu at 1400°C

(c) 44.9 wt% Ti–55.1 wt% Ni at 1310°C

(d) 61.9 wt% Sn–38.1 wt% Pb at 183°C

(e) 2.5 wt% C–97.5 wt% Fe at 1000°C

Describe three different separation processes and identify the physical/chemical/biological principle on which the separation is based.

Determine the pOH (to two decimal places) of the solution that is produced by mixing 5.83 mL of 4.19×10-2 M Mg(OH)2 with 918 mL of 3.52×10-3 M SrH2.

A vertical cylinder 76.2mm in diameter and 121.9mm high is maintained at 397.1K at its surface. It loses heat by natural convection to air at 294.3K. Heat is lost from the cylindrical side and the flat circular end at the top. Calculate the heat loss, neglecting radiation losses. Use the simplified equations of Table 1.5-2 and those equations for the lowest range of GrPr. The equivalent L use the top flat surface is 0.9 times the diameter

In textbook Engineering and Chemical Thermodynamics (2nd Edition), chapter 7 problem 33

7.33 A mixture of 2 moles propane (1), 3 moles butane (2), and 5 moles pentane (3) is contained at 30 bar and 200°C. The van der Waals constants for these species are: Species a3Jm3mol22 4 b3m3/mol4 Propane 0.94 9.06 3 1025 Butane 1.45 1.22 3 1024 Pentane 1.91 1.45 3 1024 Determine the fugacity and fugacity coeffi cient of propane using the following approximations: (a) the Lewis fugacity rule (b) the virial form of the van der Waals equation truncated to the second term.

Im unsure how to find partial molar volume here.

A benzene/toluene liquid mixture consisting of 31 mole% benzene is fed to a reboiler, where 1250 KW of heat is provided causing the mixture to partially vaporize. The vapor output has a flowrate of 80 kmol/hr and consists of 40 mole% benzene. The liquid output has a flowrate of 100 kmol/hr. The two output streams are in equilibrium and exit the reboiler at 130 oC. Determine the temperature of the feed stream. Neglect the effect of pressure and consider the following additional data: