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Laws of Thermodynamics
GATE 2013
Medium
A gaseous system contains H2, I2, and HI, which participate in the gas-phase reaction 2HI ⇌ H2+I2. At a state of reaction equilibrium, the number of thermodynamic degrees of freedom is _____
3(± 0.1 accepted)
Explanation
Gibbs phase rule with a chemical reaction: F=C−P+2−r. Here C=3 species (H2, I2, HI), P=1 phase (all gas), r=1 independent reaction. F=3−1+2−1=3.
Source: GATE CH 2013 (2013)
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