TM04 / FUSION SCIENCE / PHYSICAL CHEMISTRY
Raoult's Law
When scientific terminology admits more than one defensible reading, a good system should surface the ambiguity instead of overstating a benchmark win.
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For an ideal solution, every volatile component obeys Raoult's law across the full composition range: the partial pressure equals mole fraction multiplied by pure-component vapor pressure.
01 / CONTEXT
What the question is really testing
In an ideal dilute solution, the solvent is also commonly approximated by Raoult's law, while the solute is described by Henry's law. That distinction makes the original multiple-choice boundary important.
Fusion followed the benchmark's strict intended answer, but the broader option selected by several other models remains scientifically defensible under common textbook terminology.
02 / FAILURE MODE
Why a plausible answer can still fail
The model must reason about the scope of the claim: every component, the solvent only, or behavior across the entire composition range.
A nominal benchmark disagreement can therefore reflect wording and scoring policy rather than scientific misunderstanding.
03 / FUSION TRACE
How Fusion resolved the case
- Write the law explicitly as p_i = x_i p_i* and identify which component the statement concerns.
- Separate ideal solutions across all compositions from ideal dilute solutions around a solvent-rich limit.
- Evaluate both the benchmark's intended interpretation and the alternative scientifically defensible reading.
- Report the ambiguity and recommend a sharper question before making a comparative claim.
04 / RESULT
The comparison should not be presented as six scientifically wrong answers.
SCIENTIFIC BOUNDARY
What this result does not claim
The question should be rewritten as: In which type of solution does every volatile component strictly obey Raoult's law across the entire composition range? Results should then be rerun rather than reusing the original 2/8 figure.