Question
Asked Nov 27, 2019
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13.16. Using the Debye-Hückel theory, show that the total charge contained in the
counterion atmosphere surrounding a central ion is equal and opposite to that of
the ion, such that at long distances the central ion is completely "screened."
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13.16. Using the Debye-Hückel theory, show that the total charge contained in the counterion atmosphere surrounding a central ion is equal and opposite to that of the ion, such that at long distances the central ion is completely "screened."

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Expert Answer

Step 1

Consider a reactor system with feed stream F1 consisting of methanol and feed stream F2 consisting of air. The product stream P consist of formaldehyde gas and water. Formaldehyde gas is again reacting with oxygen to form carbon monoxide and water. Reactions are as follows:

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СH -ОН +—0, — НСНО + Н,о 2 НСНО + —0, — СО + Н,О 2

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Step 2

Assume basis as molar feed rate F1=100 kmol h-1. Molar feed rate of air is twice the molar feed rate of F1, that is 200 kmol h-1. In product stream, consider mole fraction of methanol is n1, mole fraction of formaldehyde is n2 and mole fraction of water is n3. Degree of freedom of the system = no of unknown variables + no of chemical reaction – no of mass balance equation – no of equation relating unknown variables.

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n он n ноно и о P сHg on Tco hо нано п dof 5 2-4-3 = 0

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Step 3

Mole of Oxygen in F2 feed is 21% of the total feed of air e...

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21% moles of O moles of air O2 feed-0.21x 200 ... (1) F 42 kmol h

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