Engineering

Solution Library


Determination of Excess Molar Free Energy and Free Energy of Mixing

Question Zinc and cadmium alloys conform to regular solution behavior. The following table shows the molar heats of mixing at various zinc concentrations at 723K. Calculate the excess molar free energy of mixing at Ncd = 0.85 Calculate the molar free energy of mixing at Ncd = 0.85 Does the sol ... Read More

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Calculation of Pressure Applied to Tin to Decrease its White to Gray Transition Temperature

Question Two allotropes of tin occur near room temperature. The first form of tin is called gray tin and is stable at temperature below 13.20C.  Gray tin is rather useless, it is brittle and crumbles under stress. At temperature above 13.20C, gray tin turns into white tin, the metallic form th ... Read More

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ZrO2 Three Solid Phases and Pressure-Temperature Phase Diagram for ZrO2

Question ZrO2 has three solid phases, monoclinic ( ), tetragonal (  and cubic ( ), a liquid phase and a vapor phase. All three solid phases can be sublimed but only the cubic phase can be melted. The normal melting and boiling temperatures are approximately 2500 and 35000C. The transformations ... Read More

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Gibbs Energy as a Function of Composition for given Temperatures

Question For phase diagrams shown below: Sketch the Gibbs energy as a function of composition for temperature T1, T2, T3.   Summary This question belongs to chemistry and discusses about how to sketch the Gibbs energy as a function of composition for given temperatures. Total word count: ... Read More

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Calculation of ΔG0R from ΔHR0 and ΔSR0 in BaCo3 Reaction

Question Consider the reaction of barium carbon oxide and carbon dioxide. The equilibrium constant can be obtained from the following relationships G = -RTln(Kp) Calculate: ΔG0R from ΔHR0 and ΔSR0 at 1100K. The equilibrium pressure of CO2(g) at this temperature. Summary ... Read More

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Calculation of Temperature of Allotropic Transformation and Melting Temperature

Question a)The free-energy temperature diagram shown below, determine: The melting temperature The temperature of allotropic transformation. Explain the negative slopes and negative curvatures. why?  b)Based on the part of a phase diagram below: List the phases in the order of inc ... Read More

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Calculation of Temperature of Allotropic Transformation and Melting Temperature

Question a)The free-energy temperature diagram shown below, determine: The melting temperature The temperature of allotropic transformation. Explain the negative slopes and negative curvatures. why?  b)Based on the part of a phase diagram below: List the phases α, β, &d ... Read More

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Determination of Ammonium Conversion in a Bioreactor

Question Consider the growth of enterobacter aerogenes in each of two independent chemostat operations, each of volume 500 L, each operating at steady state. Cell maintenance effects in each bioreactor are negligible, and product formation in each bioreactor is negligible. Growth of E,  aeroge ... Read More

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Determination of Cell Concentration in Bioreactors

Question Consider the growth of enterobacter aerogenes in each of two independent chemostat operations, each of volume 500 L, each operating at steady state. Cell maintenance effects in each bioreactor are negligible, and product formation in each bioreactor is negligible. Growth of E,  aeroge ... Read More

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Determination of YX/S,obs in Bioreactors

Question Consider the growth of enterobacter aerogenes in each of two independent chemostat operations, each of volume 500 L, each operating at steady state. Cell maintenance effects in each bioreactor are negligible, and product formation in each bioreactor is negligible. Growth of E,  aeroge ... Read More

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Determination of YX/S,obs in a Bioreactor

Question Consider the growth of enterobacter aerogenes in each of two independent chemostat operations, each of volume 500 L, each operating at steady state. Cell maintenance effects in each bioreactor are negligible, and product formation in each bioreactor is negligible. Growth of E,  aeroge ... Read More

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Determination of Ammonium Conversion in a Bioreactor

Question Consider the growth of enterobacter aerogenes in each of two independent chemostat operations, each of volume 500 L, each operating at steady state. Cell maintenance effects in each bioreactor are negligible, and product formation in each bioreactor is negligible. Growth of E,  aeroge ... Read More

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