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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)`

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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))

AAKASH SERIES-CHEMICAL THERMODYNAMICS-OBJECTIVE EXERCISE - 2 (HESS LAW)
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  2. N(2(g)) + 2O(2(g)) rarr 2NO(2) + xkJ, 2NO((g)) + O(2(g)) rarr 2NO(2(g)...

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  3. If S + O(2) rarr SO(2), DeltaH= -398.2kJ SO(2) + (1)/(2) O(2) rarr S...

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  4. Given that S((s)) + 3/2 O(2(g)) rarr SO(3(g)) + 2xK.cal SO(2(g)) +...

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  5. Given C((s)) + O(2(g)) rarr CO(2(g)), Delta H = -395 kJ , S((g)) + O(2...

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  6. 1)C("Graphite") + O(2(g)) rarr CO(2(g)) , DeltaH = -94 K.Cals 2) C("...

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  7. DeltaH of combustion of yellow P and red P are - 11 K.J and -9.78 KJ r...

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  8. How much energy is released when 6 mole of octane is burnt in air? Giv...

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  9. Given C+ 2S rarr CS(2), DeltaHf^(0) = +117.0 KJ mol^(-1), C + O(2) rar...

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  10. The standard heat of formation of sodium ions in aqueous solution from...

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  11. The lattice energy of solid NaCl is 180K. Call per mol. The dissolutio...

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  12. Heat of formation of CO and CO2 are -26.4, -94.0 kcal/mole respectivel...

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  13. Cl((g)) + e^(-) rarr Cl((g))^(-) , EA = -348 kJ//"mole" at 0 K. then D...

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  14. For the reaction: 2H(2(g)) + O(2(g)) rarr 2H2O((g)) , DeltaH = -571 ...

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  15. If values of DeltaHf^@ of ICl((g)), Cl((g)) and I((g)) are respective...

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  16. The enthalpy changes for the following processes are listed below:  ...

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  17. The enthalpies of HCl, NaOH ,NaCl and H(2)O are -120, -82, -148 and -6...

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  18. DeltaH^(0) for a reaction F(2) + 2HCl rarr 2HF + Cl(2) is given as -35...

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  19. What is theheat of formation of C(6)H(6), given that the heats of comb...

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  20. The heats of combustion of carbon hydrogen and acetylene are -394kJ, -...

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