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"24.22 Researchers are proposing the development of a ‘‘nano- channel reactor'' for steam reforming of methane (CH4) to fuel- cell hydrogen gas to power microscale devices. Gas phase diffusion in nanochannel A = CH4, B= H2O A+B 20 mol% CH 4 -----------------------------> Nanochannel ( NA/NB) = 0.25 300 degrees C, 0.5 atm, 200Nm diameter As each channel diameter is so small, the gas flow is likely to be very small within a given channel. Hence, gas diffusion pro- cesses may play a role in the operation of this device, particularly during the mixing and heating steps. We are specifically inter- ested in evaluating the effective diffusion coefficient of methane gas (species A, MA 1?4 16g/g: mol) in water vapor (species B, MB 1?4 18 g/g: mol) at 3008C and 0.5 atm total system pressure. The diameter of the channel is 200nm (1x 10^9 nm = 10m) A feed gas containing 20 mol % CH4 in water vapor is fed to the nanochannel with a flux ratio NA/NB = 0:25. What is effective diffusion coefficient of CH4 in the nanochannel at the feed gas conditions? Is Knudsen diffusion important?
If a solution is made by mixing 20.0 mL 0.4 M NaCH3COO with 30 mL 0.4 M CH3COOH, calculate the pH of the solution? For acetic acid, K = 1.76 x 10-5
Calculate the heat given off when 177 g of copper cools from 155.0 Celsius to 23.0 Celsius. The specific heat capacity of copper is .385 J/g C
2A(g) + 3B(g) → A2B3(g) If 0.5 atm of gas A is mixed in an evacuated reaction flask with 1.0 atm of gas B, what is the final pressure in the reaction flask? (assume that the reaction goes to completion)
When 1.00 g of urea (CO(NH2)2) is dissolved in 200g of solvent A, the freezing point is lowered by 0.250C. When 1.50 g of the nonelectrolyte Y is dissolved in 125 g of the same solvent
Hydrogen gas was cooled from 150C to 50 C. It's new volume is75 mL. What was it's original volume?
What is the molar mass of a gas if 0.358 g of the gas occupies a volume of 186 mL at 5.00C and 1.10 atm.
Compute the difference in pressure between CH4 and an ideal gas if 14.0 moles of gas are in a 6.00 litres tank at the temperature of 21.1 degree celsius . The van der Waals constants for CH4 are a =2.300 L^2 x atm/mol ^2 and b=0.0430 L/mol.
Calculate the molecule weight of the liquid If 2.31grams of the vapor of a volatile liquid is able to fill a 498-ml flask at temperature of 100 degree Celsius and pressure of 775 mm Hg? also determine the density of the vapor under these conditi..
Celsius the initial sample contained 0.0718 grams of calcium. What percent of the limestone by mass is CaCO3?
Separation of Amines and Carboxylic Acids Using Extraction, Initially have a sample of a water-insoluble, neutral organic compound dissolved in 50 mL methylene chloride that may be contaminated with
Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21
A nucleus of mass number 27 contains 14 neutrons. An atomic ion of this element has 10 electrons in it. Write the symbol for this atomic ion
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