Chpt%2020-2

# Chpt%2020-2 - Free Energy 20.3 20.4 Last time • ∆G =...

This preview shows pages 1–7. Sign up to view the full content.

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

View Full Document

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

View Full Document

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Free Energy 20.3, 20.4 Last time • ∆G = ∆H - T∆S • ∆G is negative means spontaneous • ∆G is positive means non-spontaneous • ∆S is negative means order • ∆S is positive means disorder Example • Is this reaction spontaneous? C 3 H 8 ( g ) + 5 O 2 ( g ) 3 CO 2 ( g ) + 4 H 2 O( g ) A. Always Spontaneous B. Depends on Temperature C. Never Spontaneous If you put CO 2 and H 2 O in a room long enough, will you ever get propane? Example • Solve for the ∆G of this reaction at T = 25 Celsius: S( g ) + O 2 ( g ) SO 2 ( g ) ∆H = -575.8 kJ/mol ∆S = -124.9 J/mol-K Another Example • Solve for the ∆G of this reaction at T = 25C: H 2 O( l ) H 2 O( s ) ∆H = -6.012 kJ/mol ∆S = -22.0 J/mol-K At what T does ∆G = 0? Next point • When ∆G = 0, the system is at equilibrium – Both the forward and reverse occur • When ∆G < 0, spontaneous reaction, the forward reaction dominates • When ∆G > 0, non-spontaneous reaction, the reverse reaction dominates More ∆G...
View Full Document

{[ snackBarMessage ]}

### Page1 / 15

Chpt%2020-2 - Free Energy 20.3 20.4 Last time • ∆G =...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online