Sodium hydroxide is made by the electrolysis of brine solution. The overall reaction may be written as:
2NaCl + 2H2O à 2NaOH + H2 + Cl2
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The gas phase reaction 2A + B →2C
is carried out isothermally and isobarically. The reaction is first order in A and first order in B. The feed is equal molar in A and B and the entering concentration of A is 0.5 mol/dm3. The specific reaction rate is k = 4.0 dm3/mol s.
Write the rate of reaction, –rA, solely as a function of conversion, evaluating all parameters.
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Ammonia reacts with sulphuric acid giving ammonium sulphate 2NH3 + H2SO4 à (NH4)2SO4 20 m3 of ammonia at 1.2 bar and 300 K reacts with 40 kg of sulphuric acid. Determine the excess reactant and Calculate the theoretical yield. |
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100 g of nitrogen gas reacts with hydrogen gas to produce 40g of ammonia gas according to the equation given below:
N2(g) + 3H2(g) ⇋ 2NH3(g)
Calculate the percentage yield of ammonia
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Sodium hydroxide is made by the electrolysis of brine solution. The overall reaction may be written as:
2NaCl + 2H2O à 2NaOH + H2 + Cl2
In: Other
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A solution of potassium chloride in water contains 384 g KCl per liter of the solution. The specific gravity of the solution is 1.6. Determine the following:
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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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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.
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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.
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