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For the reaction 2H(g)rarr H(2)(g), the ...

For the reaction `2H(g)rarr H_(2)(g)`, the sign of `DeltaH` and `DeltaS` respectively are :

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(i) The given reaction, `2H_((g))rarrH_(2(g))` is the formation of `H_(2(g))` from free atoms.
(ii) In the bond formation, energy is released equal and opposite to bond enthalpy of `H_(2) ` i.e., `-DeltaH_(H-H)^(@)` . Hence the reaction is exothermic and `DeltaAH` is negative.
(iii) Since two H atoms form one `H_(2)` molecule, `Deltan=1-2=-1` and disorder is decreased. Hence entropy change `Delta S lt O`.
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