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Predict in which of the following reacti...

Predict in which of the following reactions, entropy increases/decreases
`H_(2)(g) rarr 2H(g)`

Text Solution

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here 2 moles of H atoms have higher entropy than one mole of hydrogen molecule.
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Knowledge Check

  • 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 ?

    A
    `(1)/(2) C("graphite") + (1)/(2)O_(2)(g) rarr (1)/(2)CO_(2)(g)`
    B
    `C("graphite") + (1)/(2)O_(2)(g) rarr CO_(2)(g)`
    C
    `CO("graphite") + (1)/(2)O_(2)(g) rarr CO_(2)(g)`
    D
    `Mg(s) + (1)/(2)O_(2)(g) rarr MgO(s)`

  • A mixture of NH_(3)( g) and N_(2) H_(4)(g) is placed in a sealed vessel at 27^(@)C . The total pressure of the gas is 0.5 atm. The vessel is heated to 927^(@)C where the following decomposition reaction take place : N_(2) H_(4) rarr N_(2)(g) + 2H_(2)(g) 2NH_(3)(g) rarr N_(2)(g) + 3H_(2) ( g) The pressure in the vessel at this stage becomes 4.5 atm. The mole percent of NH_(3)(g) in the original mixture was :

    A
    0.25
    B
    0.6
    C
    0.75
    D
    0.8

  • On the basis of thermochemical equation (a), (b) and (c ), which of the algebric relationship is correct. ( a) C("graphite") + O_(2)(g) rarr CO_(2)(g) , Delta_(r)H = x kJ mol^(-1) (b) C("graphite") + (1)/(2)O_(2)(g) rarr CO(g) , Delta_(r)H = y kJ mol^(-1) ( c) CO(g) + (1)/(2)O_(2)(g) rarr CO_(2)(g) , Delta_(r)H = z kJ mol^(-1)

    A
    z = x + y
    B
    x = y - z
    C
    x = y + z
    D
    y = 2z - x

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