10 Questions
What is the formula for mass fraction of a component in a mixture?
$m_i = \frac{m_i}{m}$
What is the phase rule (Gibbs) equation for the number of degrees of freedom in a system?
$F=2-\pi+NC$
What is the most common type of phase equilibrium in the chemical industry?
Vapor / Liquid Equilibrium (VLE)
What does the phase rule equation $F=2-\pi+NC$ represent?
Number of variables that may be independently fixed in a state at equilibrium
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
What is the formula for calculating the mass fraction of a component in a mixture?
$m_i = \frac{m_i}{m}$
In the phase rule equation $F=2-\pi+NC$, what does the term $F$ represent?
Number of degrees of freedom in the system
What is the formula for calculating the mole fraction of a component in a mixture?
$x_i = \frac{n_i}{n}$
What is the most common type of phase equilibrium in the chemical industry?
Vapor/Liquid Equilibrium (VLE)
What does the term 'Degrees of freedom' represent in the context of the phase rule?
Number of independent decisions regarding particular process conditions
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
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.
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