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Combined State

The enthalpy ...

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The enthalpy of formation of ammonia at 298k is given as +ve per mole of NH3 (g). To which of the following equation does this value apply 1) Caco3 (s)->Cao (s)+Co2(g) 2) N2(g)+O2-->2No (g) 3) 2HgO (s)-->2Hg (s) + O2(g) 4) none of them EXPLANE IT ?

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Q. Given the enthalpy of formation of

C O_{2}

- 94.0

KJ, of CaO(s) is

- 152

KJ, and the enthalpy of the reaction

C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

is 42 KJ, the enthalpy of formation of

C a C O_{3} (s)

Q. Assertion :The enthalpy change for the reaction

C a O (s) + C O_{2 (g)} \to C a C O_{3 (s)}

is called enthalpy of formation of calcium carbonate. Reason: The reaction involves formation of 1 mole of

C a C O_{3}

from its constituent elements.

Q. The following reaction is a:

2 H g O (s) Δ - \to 2 H g (s) + O_{2} (g)

Q. Which of the following reactions will have a negative value of

△ S

?

For the reaction, $2 H g O (s) \to 2 H g (l) + O_{2} (g)$ :

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