kmt719 發表於 2006-10-22 21:16

AL Chem question

H2(g) ---->2H(g)呢個decomposition of hydrogen既sign of enthalpy change and entropy change應該係正定負?

fokck 發表於 2006-10-22 23:27


This process at least involve the breaking of H-H bond
in the hydrogen molecules H2. Breaking of covalent
bonds requires energy. Thus the enthalpy change of this
reaction must have a positive sign.

gn3509 發表於 2006-10-24 22:15

由於1mole H2 gas轉成2mole 2H gas,
gas mole數多左,ramdomness會增加左,所以entropy change係+ve
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