Chemistry / Chem 0691 · Atom · ~20 seconds
Standard State and ΔH°
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State
A standard state is a fixed reference condition, materials at 1 bar and solutions at 1 M, and ΔH° marks a change under it.
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A table listing ΔH° values for many reactions lets chemists compare them on one shared footing, regardless of when each was measured.
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ΔH°, carrying its standard-state superscript, and an ordinary ΔH under unstated conditions are not interchangeable labels.