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.

In a certain decay process, a nucleus in the vicinity of mass 240 emits alpha particles with the following energies (in MeV): 5.545 ( ao), 5.513 ( al), 5.486( a2), 5.469 ( a3), 5.443 (a4), 5.417 (a5), and 5.389 (a6). The following gamma rays in the daughter nucleus are seen (energies in keV): 26 (g1), 33(g2), 43(g3), 56(g4), 60(g5), 99(g6), 103(g7), 125(g8). Construct a decay scheme from this information, assuming a0. populates the ground state of the daughter. Keep in mind that energies can have uncertainty in measurements around 1-2 keV.

what is the purpose of heat duty in a flash drum?

The active site of an enzyme is a small portion of the enzyme molecule

What is the function of the rest of the huge molecule?

Check all that apply.

One of the olf columns in your plant failed. You have been putting together jury-rigged system to separate propane fron n-butane. The column you have found is empty, so within reason you can put in as many stages as needed. It is equipped with a partial condenser and a total reboiler. The column is restricted to a maximum pressure of 800,0 kPa, which means that refrigerator is needed. You have a source of refrigerator, but output is limited to 6000.0 kW. Freed is a saturated liquid at 800.0 kPa that is 56.0 mol% propane. Unless stated otherwise distillate should be 99.9 mol% propane, and bottoms should be 1.0 mol% propane or less. You have more feed available that can be processed.

a) generate a y-x graph at 800.0 kPa from the DePriester chart. From the depriester chart find the boiling points of propane at 800.0 kPa (set Kp=1) and n-butane at 800.0 kPa (set K(n-b)=1). The boiling range for the complete y-x diagram lies between these two temperature. Pick a temperature between the two boiling points, find Kp and K(n-b), calculate X(n-b)=(Kp-1)/(Kp-Kb), Xp=1-X(n-b), and Y(n-b)-K(n-b)X(n-b). Doing this for five to ten temperatures generates the y-x graph.

b) if you built a system with a very large number of stages (like N greater than 100) estimate the kmol/h of 99.9mol% distillate that can be produced and kmol/h of feed processed (bottoms less or equal to 1 mol% propane).

c) Repeat part b for 90.0mol% pure propane distillate and 1% or less propane in the bottoms for a saturated liquid feed.

d) if the required purity of the bottoms stream is changed to 10.0 mol% propane, repeat part b (distillate is 99.9% mol% propane).

e) repeat part b for a 99.9 mol% pure propane distillate and 1% or less propane in the bottoms if the feed is a saturated vapor that is 56.0 mol% propane.

f) epeat part b for a 99.9 mol% pure propane distillate and 1% or less propane in the bottoms if the feed is a saturated vapor that is 66.0 mol% propane.

Data: Heat of vaporization of propane at 800 kPa is 18,800 KJ/Kmol, and for butane at 800 kPa is 22,600 KJ/Kmol

Suppose the feed to a continuous reactor for ammonia synthesis consists of 100 mol/s of nitrogen, 300 mol.s-1 of hydrogen, and 1 mol/s of argon. For a fractional hydrogen conversion of 0.6, calculate the outlet flow rate of hydrogen, the extent of reaction, and the outlet flow rates of nitrogen and ammonia.

N2+3H2=2NH3