LEC 24 CHAP 19

# LEC 24 CHAP 19 - Lecture 24 Determination of Stotal for a...

This preview shows pages 1–5. Sign up to view the full content.

TOUPADAKIS Lecture 24 Chapter 19 Lecture 24 Determination of Δ S total for a Chemical Change. Free Energy (G) and Free Energy Change ( Δ G). Criterion for Spontaneous Change based on Δ G system .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
TOUPADAKIS Lecture 24 Chapter 19 Determination of Δ S total for a Chemical Change Δ S system = Δ S reaction = S ° (products) - S ° (reactants) Δ S total = Δ S system + Δ S surroundings Δ S surroundings = - Δ H reaction T surroundings
TOUPADAKIS Lecture 24 Chapter 19 Problem 1 Consider the oxidation of iron metal to Fe 2 O 3 solid. By determining the sign of Δ S total , show that the reaction is spontaneous at 25 o C. 4 Fe(s) + 3 O 2 (g) 2 Fe 2 O 3 (s) S o (JK -1 mol -1 ) 27.3 205.0 87.4 Δ H f o (kJmol -1 ) 0 0 -824.2 Answer: Δ S total = + 4980 JK -1 .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
TOUPADAKIS Lecture 24 Chapter 19 Free Energy (G) and Free Energy Change ( Δ G) We want to develop/find a new criterion for spontaneity. Why the previous criterion:
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 7

LEC 24 CHAP 19 - Lecture 24 Determination of Stotal for a...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online