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The free energy of formation of one mole of compound refers to a particular chemical equation. For each of the following, wri
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heat of formation or free energy of formation is the heat released or absorbed during the formation of a pure substance from its elements at constant pressure (in their standard states).

@ fold) + / Boz (l) foBr(s) © C (graphite) + 3 H3 (38 + vs Boll) -> CH3 Boll) © H₂ (gs & Se(s) - H₂ Se (gs @ As (S) + % H₂(gs

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