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# PS9 - C 2 H 5(g The system initially contains 3 mol H 2 for...

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ChBE 3110, Fall Semester, 2009 Chemical Engineering Thermodynamics II Problem Set Nine 1. We have two reactions in the gas phase: A + B ↔ C + D K a1 = 2.667 A + C ↔ 2E K a2 = 3.2 Feed to a reactor contains 2 moles of A and one mole of B. The reactor is at 10 bars. Assume that both reactions come to equilibrium – what is the composition of the resulting mixture. 2. A 2-liter constant volume vessel contains 0.10 gmoles of CH 4 gas. The temperature is raised to 1000ºC, where the equilibrium pressure reached is 7.02 bar. Assuming that methane dissociates by the reaction given below, calculate the K a for this reaction at 1000ºC. CH 4 (gas) ↔ C (solid) + 2 H 2 (gas) 3. The following reaction reaches equilibrium at the specified conditions. C 6 H 5 CH=CH 2 (g) + H 2 (g) = C 6 H 5
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Unformatted text preview: C 2 H 5 (g) The system initially contains 3 mol H 2 for each mole of styrene. Assume ideal gases. For styrene, a. What is Ka at 600 o C? b. What are the equilibrium mole fractions at 600 o C and 1 bar? c. What are the equilibrium mole fractions at 600 o C and 2 bar? 4. Ethanol can be manufactured by the vapor phase hydration of ethylene according to the reaction: C 2 H 4 + H 2 O = C 2 H 5 OH. The feed to a reactor in which the above reaction takes place is a gas mixture containing 25 mol% ethylene and 75 mol% steam. a. What is the value of the equilibrium constant, K a at 125 o C and 1 bar? b. Provide an expression to relate K a to ε (extent of reaction). Solve for ε . .298 .298 = 213.18 kJ/mol, = 147.36 kJ/mol o o f f G H ∆ ∆...
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