For Which Reaction Is ΔH Approximately (Or Exactly) Equal to ΔU

question 92

Multiple Choice

For which reaction is ΔH approximately (or exactly) equal to ΔU?

• A) H₂(g) + Br₂(g) → 2HBr(g)
• B) H₂O(l) → H₂O(g)
• C) CaCO₃(s) → CaO(s) + CO₂(g)
• D) 2H(g) + O(g) → H₂O(l)
• E) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)

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Definitions:

Sternomastoid

Also known as the sternocleidomastoid muscle, it is a prominent muscle in the neck that plays a key role in rotating and flexing the head.

External Oblique

A muscle located on the side and front of the abdomen, involved in rotating and laterally flexing the spine.

Transverse Abdominis

A deep muscle layer of the abdominal wall that helps stabilize the core.