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What is the standard state of substance |
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Answer» for liquids and solids is simply the state of the pure substance subjected to a total PRESSURE of 105 Pa. For most elements, the reference point of ΔHf⦵ = 0 is defined for the most stable allotrope of the element, such as graphite in the case of carbon, and the β-phase (white tin) in the case of tin. |
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