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100 litres each of gasoline (55°API), kerosene (40°API), gas oil (31°API), and isopentane (96 °API ) are mixed. The density of water at 288.5 K = 0.999 g/mL.
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In: Other
The molecular weight distributions for polyethylene terephthalate [(C10H8O4)n]
is shown in the table.. Atomic weight of C=12.0, H=1.0, O = 16.0
(c) Calculate the weight-average molecular weight of the polymer.
Show all steps of calculations.
|
Molecular weight range, gm/mol |
number fraction of the total of chains, xi |
weight fraction of the total of chains, wi |
|
1000 - 5000 |
0.01 |
0.02 |
|
5000 - 11000 |
0.10 |
0.11 |
|
11000 - 15000 |
0.31 |
0.30 |
|
15000 - 21000 |
0.13 |
0.11 |
|
21000 - 25000 |
0.10 |
0.10 |
|
25000 - 35000 |
0.05 |
0.06 |
|
35000 - 50000 |
0.10 |
0.08 |
|
50000 - 65000 |
0.10 |
0.12 |
|
65000 - 75000 |
0.10 |
0.10 |
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1. Lead oxide may be reduced according to the following: PbO2(s) + 4H+ + 2e- = 2H2O + Pb2+ Eo = 1.55 V After a solution of PbO2 is aerated (pO2 = 0.21 atm, pe = 20.75) for a period of time it is observed that Pb2+ = 10-4 mole/L. What is the pH of the solution? Note: pe = Eo / 0.059. (5 points)
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Describe how T1 and T2 can be used in determining the structural features of polymers.
In: Other
Several organizations publish occupational exposure limits (OELs) including the Occupational Safety and Health Administration's (OSHA) permissible exposure limits (PELs), the American Conference of Governmental Industrial Hygienists' (ACGIH) threshold limit values (TLVs), and the National Institute for Occupational Safety and Health's (NIOSH) recommended exposure limits (RELs). Only OSHA's PELs are legally enforceable. Discuss why you would only use the OSHA PEL at a facility where you were the safety officer, or alternatively, why you would choose to use one of the other OELs or a combination of the OELs.
In: Other
What does "Salt boundary and Void volume" represent in Size Exclusion Chromatography?
In: Other
Give the raw materials,process description,advantages,disadvantages,flow sheet for production of PENICILLIN.
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Give the raw materials,process description,advantages,disadvantages ,flow sheet for the production of CITRIC ACID
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Give the raw materials, process description,advantages,disadvantages ,flow sheet for the production of OXALIC ACID
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In the transmission of infectious diseases, aerosolised droplets (from coughing and sneezing) are an important potential mode of transmission.
The size of droplets is critical, as the size dictates the rate at which droplets settle to surfaces under the action of gravity. You have been tasked with determining the settling rate (terminal velocity) of aerosolized droplets. The droplets may be assumed to be spherical, and have the properties of water (ρ=1000 kg/m3, μ=0.001 Pas). The droplets can be assumed to be settling in a quiescent atmosphere at standard temperature and pressure.
Determine the length of time droplets of the following sizes (at their terminal velocity) take to fall a distance of 1.0 m:
• 1μm
• 200μm
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1. Explain how we learn about past climates?
2. Explain how volcanic eruptions or asteroid impacts affect climate?
3. Describe how changes in the Earth-Sun system create changing amounts of insolation?
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