Q1. A hydroelectric power plant uses the reaction of ethylene (?2?4) with oxygen to generate vapour. The products of this reaction are carbon dioxide and water. Additionally, the reaction produces −1323.16?? per mol of ethylene consumed. a) How much ethylene is required by the power plant if 8500 kg of steam at 120 °C is produced in an hour? (assume 100% yield) (12.5 marks) b) Recalculate your answer for a 75 % yield. (12.5 marks) Assumptions. The heat capacities of water are C?? = 4.19 kJ⁄kg°C, ??? = 1.996 ??⁄??°C, the heat of ?? vaporization for water is ∆h? = 2256.9 ⁄??, and the power plant takes water from a source at 15 °C.

Acetylene is hydrogenated to form ethane. The feed to the reactor contains 1.50 mol H2 /mol C2H2. Write the stoichiometric equation for this reaction, and then answer the following questions:

1) Calculate the stoichiometric reactant ratio of hydrogen to acetylene (mol H2 / mol C2H2).

2)Identify the limiting reactant, and then calculate the percentage by which the other reactant is in excess.

3) Calculate the extent of reaction, assuming all of the limiting reactant is consumed. Use a basis of 1 mol/sec of acetylene feed.

4) Calculate the mass feed rate of hydrogen (kg/s) required to produce 2.98x10^6 metric tons of ethane per year, assuming that all of the limiting reactant is consumed and the process operates for 24 hours a day, 300. days a year. Report your result with three significant figures.

One mole of Neon at T=298K and P=10.0 bar expands to final pressure of 1.0 bar. Calculate the final temperature, q, w, change in energy, enthalpy, eand entropy when the expansion is carried our according to the following scenarios:

A. They system is held in a heat bath that maintains constant temperature and the expansion is carried out very slowly and carefully, with the external pressure being gradually reduced from 10 bar to 1 bar.

B. The system is held in a constant-temperature bath, but the external pressure is reduced suddenly from 10 bar to 1.0 bar at the very begining and kept at 1.0 bar thereafter.

C. The system is thermally insulated and the external pressure is reduced slowly and carefully.

D. The system is thermally insulated, and expand into an evacuated container having 10 times the volume of the flask. No external pressure opposes the expansion.

A qualitative analysis of the bioreactor modes of operation, outlining their advantages and limitations.

1. batch

2. fed-batch

3. continuous mode (chemostat)

4. perfusion system

Calculate H298 and S298 for the following reactions:
a) 2TiO + ½ O2 = Ti2O3
b) 3Ti2O3 + ½ O2 = 2Ti3O5
c) Ti3O5 + ½ O2 = 3TiO2

5. A mixture of methane and air is capable of being ignited only if the mole percent of methane is between 5% and 15%. A mixture containing 14.0 mole% methane in air flowing at a rate of 600. kg/h is to be diluted with pure air to reduce the methane concentration to the lower flammability limit. Calculate the required flow rate of air in kmol/h and the percent by mass of oxygen in the product gas.

Where would the surface ocean water be densest?

a. in the bay of bengal

b. in the gulf of mexico

c. east of brazil

d. in the pacific, east of japan

e. in the norwegian sea

Draw the densest packed plane for the three types of cubic unit cells. Clearly label the plane and the unit cell type

Which terrestrial planet has the densest atmosphere? What is this planet’s atmosphere made of? What consequence does this dense atmosphere have on the temperature of the planet?

As a food chemist for a major potato chip company, you are responsible for determining the salt content of new potato chip products for the packaging label. The potato chips are seasoned with table salt, NaCl. You weigh out a handful of the chips, boil them in water to extract the salt, and then filter the boiled chips to remove the soggy chip pieces. You then analyze the chip filtrate for Cl− concentration using the Mohr method.

First you prepare a solution of silver nitrate, AgNO3, and titrate it against 0.500 g of KCl using the Mohr method. You find that it takes 64.1 mL of AgNO3 titrant to reach the equivalence point of the reaction.

You then use the same silver nitrate solution to analyze the chip filtrate in a Mohr reaction, finding that the solution yields a rusty brown precipitate when 49.2 mL of titrant is added.

If the sample of chips used to make the filtrate weighed 75.5 g , how much NaCl is present in one serving (125 g ) of chips?

The reaction 3A  B + C occurs in water, with a known pre-exponential rate factor of 0.12 L/mol sec and an activation energy of 4.3 kcal/mol. The inlet feed to a reactor is 2.5M A, flowing at 15 L/min. The outlet stream contains 0.65M B. If the reactor is run at 55°C, what is the residence time for a: Pftr and Cstr

A mass of 70 kg of 15-wt-% solution of H₂SO₄ in water at 70 ^oC is mixed at atmospheric pressure with 110 kg of 80-wt-% H₂SO₄ at 38^oC. During the process heat in the amount of 20,000 kJ is transferred from the system. Determine the temperature of the product solution

Identify and briefly describe one engineering or manufacturing application of electrodeposition.