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Unformatted text preview: Calculate H rxn for the following reaction: CH 4 (g) + 4 Cl 2 (g) CCl 4 (g) + 4 HCl (g) Use the following reactions and given H's. C (s) + 2 H 2 (g) CH 4 (g) H = -74.6 kJ C (s) + 2 Cl 2 (g) CCl 4 (g) H = -95.7 kJ H 2 (g) + Cl 2 (g) 2 HCl (g) H = -92.3 kJ Define standard enthalpy of formation. What are standard states for compounds and elements and at what temperature and pressure are they determined at? How do you determine the standard enthalpy of a reaction? Hydrazine (N 2 H 4 ) is a fuel used by some spacecraft. It is normally oxidized by N 2 O 4 according to the following equation: N 2 H 4 (l) + N 2 O 4 (g) 2 N 2 O (g) + 2 H 2 O (g) Calculate H o rxn for this reaction using standard enthalpies of formation. H o f N 2 H 4 = 50.6 kJ/mol H o f N 2 O 4 = 11.1 kJ/mol H o f N 2 O = 81.6 kJ/mol H o f H 2 O = -241.8 kJ/mol...
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This note was uploaded on 07/22/2008 for the course CHEM 105A taught by Professor Bau during the Summer '04 term at USC.
- Summer '04