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The correct thermochemical equation is :...

The correct thermochemical equation is :

A

`C+O_(2)rarr CO_(2) , Delta H =-94` Kcal

B

`C+O_(2)rarr CO_(2) , Delta H = +94.0` Kcal

C

`C(s)+O_(2)(g)rarr CO_(2)(g) , Delta H = -94` Kcal

D

`C(s)+O_(2)(g)rarr CO_(2)(g) , Delta H = +94` Kcal

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The correct Answer is:
C
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Which of the following are applicable for a thermochemical equation ? It tells :

Calculate the lattice enthalpy of MgBr_(2) from the given date: {:(Mg(s)+Br_(2)(l)rarrMgBr_(2)(s),,Delta_(f)H^(@)=-524 kJ mol^(-1)),(Mg(s)rarrMg(s),,Delta_(1)H^(@)=+148 kJ mol^(-1)),(Mg(g)rarrMg^(2+)(g)+2e^(-),,Delta_(2)H^(@)=+2187 kJ mol^(-1)),(Br_(2)(l)rarrBr_(2)(g),,Delta_(2)H^(@)=+2187 kJ mol^(-1)),(Br_(2)(l)rarrBr_(2)(g),,Delta_(3)H^(@)=+31 kJ mol^(-1)),(2Br(g)+2e^(-)rarr2Br(g),,Delta_(5)H^(@)=-662 kJ mol^(-1)):} Strategy : The thermochemical equation corresponding to lattice enthalpy of MgBr_(2) is {:(Mg^(2+)(g)+2Br^(-)(g)rarrMgr_(2)(s),,,Delta_("Lattice")H^(@)=?):} Add the last five thermochemical equations to the thermochemical equation corresponding to lattice enthalpy to get the thermochemical equation for the formation of MgBr_(2) (s) from its constituent element. Finally, calculate Delta_(Lattice) H^(@) , using the concept of Hess's law.

What is a thermochemical equation? Explain why is it essential to mention the physical states of reactants and products in thermochemical equations.

ALLEN-THERMODYNAMICS -EXERCISE -3
  1. Which plot represents for an exothermic reaction ?

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  2. Which of the following are applicable for a thermochemical equation ? ...

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  3. The correct thermochemical equation is :

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  4. The enthalpy changes of formation of the gaseous oxides of nitrogen (N...

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  5. Delta H for transition of carbon in the diamond form to carbon in the ...

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  6. Which respresent an exothermic reaction :-

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  7. Which of the following value of DeltaH(f)^(@) represent that the produ...

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  8. S(("rhombic"))+O(2(g))rarr SO(2(g)) , Delta H =-297.5 K J S(("monocl...

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  9. Heat of formation, Delta H(f)^(@) of an explosive compound like NCl(3)...

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  10. According to the following reaction C(S)+1//2O(2)(g)rarr CO(g), Delta ...

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  11. Which of the following represents an exothermic reaction :-

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  12. The heat change during the reaction 24g C and 128g S following he chan...

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  13. For the reaction ,3O(2)rarr 2O(3),DeltaH=+ve. We can say that :

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  14. From the reaction P(White) rarr P(Red) Delta H =-18.4KJ, it follows th...

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  15. In Kirchoff's equation which factor affects the heat of reaction :

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  16. For the reaction , H(2)(g)+1//2O(2)(g)=H(2)O(l), Delta C(p)=7.63 "cal/...

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  17. The enthalpy of a reaction at 273 K. is -3.57 KJ. What will be the ent...

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  18. For the reactions, (i) H(2)(g)+Cl(2)(g)rarr 2HCl(g)+ xKJ (ii) H(2)...

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  19. Since the enthalpy of elements in their natural state is taken to be z...

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  20. For the reaction H(2)+I(2)hArr2NHI, DeltaH=12.40 kcal. The heat of f...

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