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The activiation energy for the reacti...

The activiation energy for the reaction `2HI(g) to H_(2) + I_(2)(g)` is `209.5 KJ mol^(-1)` at 581 K.Calculate the farction of molecules of reactants having energy equal to or greater than activation energy ?

Text Solution

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The correct Answer is:
`1.47 xx 10^(-19)`
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The activation energy for the reactio 2HI_((g))to H_(2(g))+I_(2(g))at 581 K is 209. 5kJ//mol. Calculte the fraction of molecules having energy equal to or grater than activation energy. [R=8.31 JK^(-1)mol ^(-1)]

The first order rate constant for the decomposition of ethyl iodide by the reaction. C_(2)H_(2)I (g)to C_(2)H_(4) (g)+ HI (g)at 600K is 1.60 xx10^(-5)s^(-1). It is energy of activation is 209 kJ/mol. Calculate the rate constant of the reaction at 700 K.

Knowledge Check

  • If the activation energy for the forward reaction is 150kJ mol^(-1) and that of the reverse reaction is 260kJ mol^(-1) . What is the enthalpy change for the reaction

    A
    `410kJ mol^(-1)`
    B
    `-110 kJ mol^(-1)`
    C
    `110kJ mol^(-1)`
    D
    `-410kJ mol^(-1)`

  • The Delta H value for the reaction, H_(2) + Cl_(2) to 2HCl is - 44.12 Kcal If E_(1) is the activation energy of the reactants and E, is the activation energy of the products, for the above reaction.

    A
    `E_(1) gt E_(2)`
    B
    `E_(1) lt E_(2)`
    C
    `E_(1) = E_(2)`
    D
    `Delta H` is not related to `E_(1) or E_(2)`

  • For the reaction 2H_(2(g)) + o_(2(g)) rarr 2H_(2)O_((g)), Delta H^(@) = - 573.2 kJ . The heat of decomposition of water per mol is:

    A
    286.6kJ
    B
    573.2 kJ
    C
    `-28.66` k Cal
    D
    68.56 kCal

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