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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

`-473.6kJ "mol^(-1)`

B

`-98.9kJ "mol^(-1)`

C

`+473.6 kJ "mol^(-1)`

D

`+187.8 kJ "mol^(-1)`

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The correct Answer is:
B
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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

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)) = ?

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

The enthalpy of solution of BaCl_(2)(s) and BaCl_(2).2H_(2)O(s) " are " -20.6 and 8.8 KJ mol^(-1) , respectively, The enthalpy change for the reaction BaCl_(2(s)) + 2H_(2)O rarr BaCl_(2), 2H_(2)O_((s)) is:

The absolute entropies of H_(2(g)), O_(2(g)) and H_2O_((l)) are respectively 130.6, 205.1 and 69.9 JK-mol^(-1) . Calculate the value of DeltaS for the formation of one mole liquid water.

At 298K heats of formation of H_(2)O_((l)), CO_(2(g)), HCl_((g)) and C Cl_(4(l)) are respectively -241.8, -393.7, -92.5 and -106.7 kJ mol^(-1) . Calculate DeltaH for the following reaction C Cl_(4(l)) + 2H_2O_((g)) to CO_(2(g)) + 4HCl_((g))

Assertion (A): The enthalpy of formation of H_(2)O_((l)) is greater than that of H_(2)O_((g)) Reason (R ): Enthalpy change is negative for the condensation reaction H_(2)O_((g)) rarr H_(2)O_((l))

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