Question

If solid tin is in equilibrium with its vapor, the degree of freedom is (answer in integer) .............

Hint:

At equilibrium between phases, the Gibbs phase rule is the fastest way to calculate degrees of freedom. Remember: a two-phase single-component system always has one degree of freedom.

Answer 1

Correct Answer: 1

Step 1: Recall Gibbs phase rule.
The formula is: \[ F = C - P + 2 \] where: - \(F\) = degrees of freedom, - \(C\) = number of components, - \(P\) = number of phases.

Step 2: Identify components and phases.
- Substance: tin (Sn) → only one chemical species present. \[ C = 1 \] - Phases: solid tin + vapor phase. \[ P = 2 \]

Step 3: Apply Gibbs phase rule.
\[ F = C - P + 2 = 1 - 2 + 2 = 1 \] Final Answer:
\[ \boxed{1} \]