In Which of the Reactions Below Is ΔH an Enthalpy

question 22

Multiple Choice

In which of the reactions below is ΔH an enthalpy of formation?

• A) S₈(s)+ 8O₂(g)→ 8SO₂(g)
• B) N₂(g)+ O₂(g)→ 2NO(g)
• C) H₂(g)+ Cl₂(g)+ 4O₂(g)→ 2HClO₄(l)
• D) Cu(s)+ 1/2I₂(s)→ CuI(s)
• E) CH₄(g)+ 2O₂(g)→ CO₂(g)+ 2H₂O(g)

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Definitions:

Community

A group of interacting living organisms sharing a populated environment, often considered within the context of ecological and biological studies.

Atmospheric Reservoir

refers to the part of the Earth's atmosphere that acts as a storage place for gases and plays a key role in the global climate.

Carbon Cycle

The series of processes by which carbon compounds are interconverted in the environment, chiefly involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.

Decomposer

Organism, usually a bacterium or fungus, that breaks down organic matter into inorganic nutrients that can be recycled in the environment.