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The standard enthalpies of formation of ...

The standard enthalpies of formation of `H_(2)O_(2(l)) and H_(2)O_((l))` are `-187.8kJ "mole"^(-1) and -285.8 kJ "mole"^(-1)` respectively. The `DeltaH^(0)` for the decomposition of one mole of `H_(2)O_(2(l)) " to" H_(2)O_((l)) and O_(2(g))` is

A

`-473.6 K.J. "mole"^(-1)`

B

`-98.0 K.J. "mole"^(-1)`

C

`+473.6 K.J. "mole"^(-1)`

D

`+187.8 K.J."mole"^(-1)`

Text Solution

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The correct Answer is:
B
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Heats of formation of CH_(3)COOH(l), CO_(2)(g) and H_(2)O(l) are respectively -487, -394 and -286 kJ mol^(-1) . Calculate the heat of combustion of acetic acid.

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Knowledge Check

  • The standard enthalpies of formation of H_(2)O_(2(l)) and H_(2)O_((l)) " are " -187.8 kJ "mole"^(-1) and -285.8 kJ "mole"^(-1) respectively. The Delta H^(0) for the decomposition of one mole of H_(2)O_(2(l)) " to " H_(2)O_((l)) and O_(2(g)) is

    A
    `-473.6 kJ. "mole"^(-1)`
    B
    `-98.9 kJ "mole"^(-1)`
    C
    `+473.6 kJ "mole"^(-1)`
    D
    `+187.8 kJ "mole"^(-1)`

  • If DeltaH_(f)^(0) " for" H_(2)O_(2(l)) and H_(2)O_((l)) " are " -188 kJ mol^(-1) and -286 kJ mol^(-1) , what will be the enthalpy change of the reaction 2H_(2)O_(2(l)) rarr 2H_(2)O_((l)) + O_(2(g)) = ?

    A
    `146 kJ mol^(-1)`
    B
    `-196 kJ mol^(-1)`
    C
    `-494 kJ mol^(-1)`
    D
    `-46.88` kCal `"mole"^(-1)`

  • How many coulombs are required for the oxidation of 1 mole of H_(2)O_(2) to O_(2) ?

    A
    `93000C`
    B
    `1.93xx10^(5)C`
    C
    `9.65xx10^(4)C`
    D
    `19.3xx10^(2)C`

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