For a chemical reaction at constant \( \mathrm{P} \) and \( \mathrm...

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For a chemical reaction at constant \( \mathrm{P} \) and \( \mathrm{V}, \Delta \mathrm{H} \)
\( \mathrm{P} \) is equal to

W
(1) \( \Delta \mathrm{U} \)
(2) Zero
(3) \( \Delta \mathrm{U}+\mathrm{P} \Delta \mathrm{V} \)
(4) \( \mathrm{p} / \mathrm{T} \)
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