Chapter 10, Problem 10.22P

Interpretation Introduction

Interpretation:

To find the ratio of fugacity of steam at initial state to fugacity at the final state from 9000 kPa and 400 ⁰C to 300 kPa.

Concept Introduction :

Gibbs energy is given as below,

  $G=\Gamma (T)+RT\ln (f)$

and it is related to enthalpy and entropy as given below,

  $G=H-TS$

Where,

G = Gibbs Energy

T₁ = Initial Temperature = 400 ⁰C

H₁ = Initial Enthalpy

S₁ = Initial Entropy

f₁ = Initial fugacity

T₂ = Final Temperature = 400 ⁰C

H₂ = Final Enthalpy

S₂ = Final Entropy

f₂ = Final fugacity

R = Universal Gas constant = 8.314 J/molK

m = Molecular weight = 18 g/mol