How Much Heat Is Released During the Combustion of Methane

question 74

Multiple Choice

How much heat is released during the combustion of methane using the given bond dissociation energies:
CH₄ + 2 O₂ → CO₂ + 2H₂O
Number and types of bonds in each molecule:
CH₄ (4 C-H bonds) ;O₂ (1 O=O) ; (2 C=O bonds) ; (2 O-H bonds) .
Bond dissociation energies:
C-C (347 kJ/mol) ;C-H (413 kJ/mol) ;O=O (498 kJ/mol;C=O (799 kJ/mol) ;O-H (467 kJ/mol)

• A)-382 kJ
• B)-8181 kJ
• C)282 kJ
• D)818 kJ
• E)696 kJ

Explain the conditions under which modifications to contracts require additional consideration under common law versus the UCC.

Discuss specific transactions that are enforceable without consideration (e.g., promissory estoppel, moral obligations).

Discriminate between enforceable promises and non-binding promises such as illusory promises and past consideration.

Understand the legal concepts related to substituted contracts and their effects on original agreements.

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