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Explain standard enthalpy of reaction....

Explain standard enthalpy of reaction.

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Standard enthalpy of reaction is the change in enthalpy that occurs, when the number of moles of the reactants indicated by the balanced chamical equation have completely reached under standard conditions, that is, 298 K and one bar pressure `[Delta H^(@)]`
Example : `H_(2(g)) + (1)/(2)O_(2(g)) rarr H_(2)O_((l)) , Delta H^(@) = -285.8 kJ`.
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Knowledge Check

  • Which of these species has a standard enthalpy of formation equal to zero ?

    A
    `F_(2)(g)`
    B
    F(g)
    C
    HF(aq)
    D
    `F^(-)(aq)`

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