This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: 2 ( g ) CS 2 ( l ) + 3O 2 ( g ) H = +1072 kJ/mol rxn + C (graphite) + 2S (rhombic) CS 2 ( l ) H = -393.5 + (2x-296.1) + 1072 = 86.3 kJ/mol rxn Benzene (C 6 H 6 ) burns in air to produce carbon dioxide and liquid water. How much heat is released per mole of benzene combusted? The standard enthalpy of formation of benzene is 49.04 kJ/mol. 2C 6 H 6 ( l ) + 15O 2 ( g ) 12CO 2 ( g ) + 6H 2 O ( l ) H rxn n H (products) f = m H (reactants) f - H 6 H (H O 12 H (CO + 2 H (C H rxn (H 2 O) f 2 ) f = [ ] -(C 6 H 6 ) f [ ] H rxn = [12x(393.5)+ 6x(187.6)] [ 2x49.04 ] = -5946 kJ-5946 kJ 2 mol = - 2973 kJ/mol C 6 H 6...
View Full Document