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lecture21_upload - The chemical reaction: 2Fe 2 O 3 ( s ) +...

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Unformatted text preview: The chemical reaction: 2Fe 2 O 3 ( s ) + 3 C ( graphite ) 4 Fe ( s ) + 3 CO 2 ( g ) A . Is always spontaneous B . Is never spontaneous C. Can occur only at very high temperatures D . Can occur only at very low temperatures Note : Assume that H o and S o do not change much with temperature. Fe 2 O 3 ( s ) C ( graphite ) Fe ( s ) CO 2 ( g ) S o H o f (J/mol.K) (kJ/mol) 87.40-825.5 5.6-393.5 27.78 213.74 Blast furnace in Sestao (Spain) Example of type-1 reaction: Example of type-2 reaction: Example of type-3 reaction: Example of type-4 reaction: Fe 2 O 3 ( s ) + 3 C ( graphite ) 4 Fe ( s ) + 3 CO 2 ( g ) 2H 2 ( g ) + O 2 ( g ) 2H 2 O ( l ) H 2 ( g ) + Cl 2 ( g ) 2 HCl ( g ) N 2 ( g ) + 2O 2 ( g ) 2 NO 2 ( g ) 2 H 2 ( g ) + O 2 ( g ) 2 H 2 O ( g ) Spontaneous (under standard conditions) ? H 2 ( g ) + Cl 2 ( g ) 2 HCl ( g ) N 2 ( g ) + 2O 2 ( g ) 2 NO 2 ( g ) CH 3 CH 2 OH ( aq ) CH 3 CHO ( g ) + H 2 ( g ) Ba(OH) 2 ( s ) + 2 NH 4 SCN ( s ) Ba(SCN) 2 ( aq ) +2 NH 3 ( aq ) + 2 H 2 O ( l ) J. Willard Gibbs J. Willard Gibbs 1839-1903 1839-1903-50.8-50....
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lecture21_upload - The chemical reaction: 2Fe 2 O 3 ( s ) +...

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