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For which of the following reactions, De...

For which of the following reactions, `Delta H` is greater than `Delta U` ?

A

`N_(2)(g) + 3 H_(2)(g) rarr 2 NH_(3)(g)`

B

`CH_(4)(g) + 2O_(2)(g) rarr CO_(2)(g) + 2H_(2)O(l)`

C

`PCl_(5)(g) rarr PCl_(3)(g) + Cl_(2)(g)`

D

`HCl(aq) + NaOH(aq) rarr NaCl(aq) + H_(2)O(aq)`

Text Solution

Verified by Experts

The correct Answer is:
C
`Delta H = DeltaU +Delta n_(g)` RT. For this reaction,
`Delta n_(g) =2-1=1`
`:. Delta H gt Delta U`
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Knowledge Check

  • For which of the following reactions, Delta H is equal to Delta U ?

    A
    `N_(2)(g) + 3 H_(2)(g) rarr 2 NH_(3)(g)`
    B
    `PCl_(5)(g) rarr PCl_(3)(g) + Cl_(2)(g)`
    C
    `2 H_(2)S(g) + 3 O_(2)(g) rarr 2 H_(2)O(l) + 2 SO_(2)(g)`
    D
    `C(s) + O_(2)(g) rarr CO_(2)(g)`.

  • For which of the following reactions, Delta S is not positive ?

    A
    `I_(2)(s) rarr I_(2)(g)`
    B
    `CuO(s) + H_(2)(g) rarr Cu(s) + H_(2)O(l)`
    C
    `2O_(3)(g) rarr 3O_(2)(g)`
    D
    `CH_(4)(g) + 2O_(2)(g) rarr CO_(2)(g) + H_(2)O(g)`

  • Which of the following has DeltaS^@ greater than zero?

    A
    `CaO(s)+CO_2(g)iff CaCO_3(s)`
    B
    `NaCl(aq) iff NaCl(s)`
    C
    `NaNO_3(s)iff Na^+(aq)+NO_3^-(aq)`
    D
    `N_2(g)+3H_2(g)iff2NH_3(g)`

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    In which of the following reactions, standard reaction entropy change (Delta S^(@)) is positive and standard Gibb's energy (Delta G^(@)) decreases sharply with increasing temperature ?

    Under which of the following conditions is the relation Delta H = Delta U + p Delta V valid for a closed system ?

    For which one of the following equations is Delta H_(“reaction”)^@ equal to Delta_(f)^@ for the product?

    For which one of the following equations is Delta_(r) H^(theta) equal to Delta_(f) H^(theta) for the product ?

    For which reaction, Delta H ne Delta U .

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