What is the number of degrees of freedom for a gaseous mixture containing H2 and NH3_________________?
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Answer: D. 3
Explanation
Gibbs phase rule calculates degrees of freedom using components minus phases plus two. A gaseous mixture of hydrogen and ammonia forms a single homogeneous gas phase. Two components minus one phase plus two equals three independent variables to specify. Gibbs phase rule determines the variance of thermodynamic systems in equilibrium. Number of components equals the minimum chemical species needed to describe all phases. Number of phases represents physically distinct homogeneous regions within the system.
Chemical reaction engineers use phase rule calculations to specify operating conditions. Designing gas absorption columns requires knowing system degrees of freedom for control. Thermodynamic system optimization relies on controlling temperature, pressure, and composition. Zero degrees of freedom occurs at invariant triple points where no variables can change. One degree of freedom leaves only a single variable free to change in equilibrium. Two degrees of freedom misses the extra compositional variable present in binary mixtures.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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