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For a mixture of solid, liquid and vapour phases of a pure substance in equilibrium, what is the number of independent intrinsic properties needed ?
  • a)
    0
  • b)
    1
  • c)
    2
  • d)
    3
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
For a mixture of solid, liquid and vapour phases of a pure substance i...
From Gibb's phase rule
C + 2 = P + F
For pure substance C= 1
Phases present, P - 3
1 + 2 = 3 + F
F = 0
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Most Upvoted Answer
For a mixture of solid, liquid and vapour phases of a pure substance i...
Equilibrium of a Pure Substance

Equilibrium is a state in which the properties of a system do not change with time. In a system containing multiple phases of a pure substance (solid, liquid, vapour), the number of independent intrinsic properties needed to describe the system depends on the number of phases present.

Number of Independent Intrinsic Properties

For a system containing only one phase, a single independent intrinsic property (such as pressure, temperature, or specific volume) is needed to describe the state of the system. However, for a system containing multiple phases in equilibrium, the number of independent intrinsic properties needed is zero.

Explanation

In a system containing multiple phases of a pure substance in equilibrium, the intensive properties (such as temperature and pressure) are the same in all phases. This is because the phases are in thermal, mechanical, and diffusive equilibrium with each other. Therefore, the state of the system is completely determined by the number of phases present and the values of the intensive properties.

Conclusion

In conclusion, for a mixture of solid, liquid, and vapour phases of a pure substance in equilibrium, the number of independent intrinsic properties needed is zero. This is because the intensive properties are the same in all phases, and the state of the system is completely determined by the number of phases present.
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