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Gibbs energy of Gibbs function, G, is de...

Gibbs energy of Gibbs function, `G`, is defined as

A

`G = U + TS`

B

`G = H - TS`

C

`G = H + TS`

D

`G = U - TS`

Text Solution

Verified by Experts

The correct Answer is:
B
Gibbs energy is the part of total energy which is available for doing useful work. `H` stands for total energy of the system while `TS` stands for energy for nonuseful work (or the energy which is not available to do useful work).
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Knowledge Check

  • Gibb's free energy G is defined as

    A
    `G=H-TS`
    B
    `G=H+TS`
    C
    `G=U-TS`
    D
    `G=U+TS`

  • The standard Gibbs energy of formationk is nonzero for

    A
    `C` (graphite)
    B
    `O_(2) (g)`
    C
    `O_(3) (g)`
    D
    `S` (rhombic)

  • Statement 1: For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero, and Statement 2: At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.

    A
    Statement 1 is true, statement 2 is true, statement 2 is correct explanation for statement 1.
    B
    Statement 1 is true, statement 2 is true, statement 2 is not a correct explanation for statement 1.
    C
    Statement 1 is true, statement 2 is false
    D
    Statement 1 is false, statement 2 is true

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    Gibbs Energy Of Cell

    Assertion (A): For every chemical reaction at equilibrium, standard Gibbs enegry of the reaction is zero. Reason (R ) : At constant temperature and pressure chemical reactions are spontaneous in the direction of the decreasing Gibbs energy.

    The following curve represnets the variation of Gibbs function 'G' with pressure at constant temperature. Correct match of given plots with the physical state of a substance is

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    A plot of Gibbs energy of a reaction mixture against the exent of the reaftion is :

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