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Chemical Engineering Phase Equilibrium Quiz

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Chemical Engineering Phase Equilibrium Quiz

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Questions and Answers

What is the formula for mass fraction of a component in a mixture?

$x_i = \frac{m_i}{m}$

$m_i = \frac{m_i}{m}$ (correct)

$x_i = \frac{n_i}{N}$

$m_i = \frac{n_i}{N}$

What is the phase rule (Gibbs) equation for the number of degrees of freedom in a system?

$F=2-NC+\pi$

$F=2+\pi-NC$

$F=2-\pi+NC$ (correct)

$F=\pi-2+NC$

What is the most common type of phase equilibrium in the chemical industry?

Gas / Solid Equilibrium (GSE)

Gas / Liquid Equilibrium (GLE)

Vapor / Liquid Equilibrium (VLE) (correct)

Solid / Liquid Equilibrium (SLE)

What does the phase rule equation $F=2-\pi+NC$ represent?

Number of variables that may be independently fixed in a state at equilibrium Signup and view all the answers

Why are degrees of freedom important in design applications?

They represent the number of independent decisions you are able to make regarding particular process conditions Signup and view all the answers

What is the formula for calculating the mass fraction of a component in a mixture?

$m_i = \frac{m_i}{m}$ Signup and view all the answers

In the phase rule equation $F=2-\pi+NC$, what does the term $F$ represent?

Number of degrees of freedom in the system Signup and view all the answers

What is the formula for calculating the mole fraction of a component in a mixture?

$x_i = \frac{n_i}{n}$ Signup and view all the answers

What is the most common type of phase equilibrium in the chemical industry?

Vapor/Liquid Equilibrium (VLE) Signup and view all the answers

What does the term 'Degrees of freedom' represent in the context of the phase rule?

Number of independent decisions regarding particular process conditions Signup and view all the answers

Study Notes

Formulas for Mixture Composition

The formula for mass fraction of a component in a mixture is: mass of component / total mass of mixture
The formula for mole fraction of a component in a mixture is: moles of component / total moles in mixture

The Phase Rule

The phase rule equation is: F = 2 - π + NC, where F is the number of degrees of freedom
The term F in the phase rule equation represents the number of degrees of freedom in a system
Degrees of freedom are important in design applications because they determine the number of variables that can be changed independently in a system

Phase Equilibrium

The most common type of phase equilibrium in the chemical industry is vapor-liquid equilibrium
Phase equilibrium occurs when the rates of condensation and evaporation are equal, resulting in a dynamic equilibrium

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Description

Test your understanding of phase equilibrium and vapor/liquid equilibrium in chemical engineering with this quiz covering measures of composition, mass fraction, mole fraction, molar mass of mixtures, molar concentration, and systems with variable composition. This quiz is based on Chapters 12, 13 (new edition), and Chapter 10 (7th edition) of a relevant textbook.