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# PS6F07 - Chemistry 391 Problem Set 6(Due Monday October 22...

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Chemistry 391 Fall 2007 Problem Set 6 (Due, Monday October 22) 1. Using the following combustion reactions () 0 42 2 2 CH (g)+O (g) 2 O l +CO (g) 212.8kcal/mol HH →Δ = 0 22 C(s)+O (g) CO (g) 94.05kcal/mol H = 0 222 1 H (g)+ O (g) H O(l) 68.32kcal/mol 2 H = determine 0 H Δ for the reaction 24 C(s)+2H (g) CH (g) (at 298.15 K) Now use Hess’s law (using Levine’s table of heats of formation) to evaluate the same reaction’s enthalpy. How do they compare? 2. Calculate reaction H Δ D and reaction U Δ D at 298.15 K for the following reactions. a) 4NH 3 ( g ) + 6NO( g ) 5 N 2 ( g ) + 6H 2 O( g ) b) 2NO( g ) + O 2 ( g ) 2NO 2 ( g ) 3. From the data tabulated below, calculate ( ) 391.4 K reaction H Δ D for the reaction CH 3 COOH( g ) + 2O 2 ( g ) 2H 2 O( g ) + 2CO 2 ( g ). Assume that the heat capacities are independent of temperature. CH 3 COOH( l ) + 2O 2 ( g ) 2H 2 O( l ) + 2CO 2 ( g ) ( ) 298 K reaction H Δ D = –871.5 kJ mol -1 H 2 O( l ) H 2 O( g ) ( ) 373.15 K reaction H Δ D =40.656 kJ mol -1 CH 3 COOH( l ) CH 3 COOH( g ) ( ) 391.4 K reaction H Δ D = 24.4 kJ mol -1 Substance CH 3 COOH( l ) O 2 ( g )C O 2 ( g )H 2 O( l 2 O( g ) , P m C / R 14.9 3.53 4.46 9.055 4.038 4. Calculate reaction

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PS6F07 - Chemistry 391 Problem Set 6(Due Monday October 22...

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