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For the change,C("diamond") rarr C("grap...

For the change,`C_("diamond") rarr C_("graphite"), Delta H = -1.89 kJ` , if 6 g of diamond and 6 g of graphite are separately burnt to yield `CO_2` the heat liberated in first case is:

A

Less than in the second case by 1.89 KJ

B

Less than in the second case by 11.34 KJ

C

Less than in the second case by 14.34 KJ

D

More than in the second case by 0.945 KJ

Text Solution

Verified by Experts

The correct Answer is:
D
`C_("Diamond")rarr C_("graphite") , Delta H =-1.89 KJ mol^(-1)`
For 6g conversion of diamond into graphite
`Delta H=(-1.89)/(2)=-0.945 KJ`
`(1)/(2)C_("Diamond")rarr (1)/(2)C_("Graphite"), Delta H=-0.945 KJ`
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ALLEN-THERMODYNAMICS -EXERCISE -3
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  2. The heat of combustion of yellow phoshphorus and red phosphorus are -9...

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  3. For the change,C("diamond") rarr C("graphite"), Delta H = -1.89 kJ , i...

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  4. 2CO((g))+O(2(g))rarr 2CO(2(g))+X KJ In the above equation X KJ refers ...

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  5. Which of the following reactions represents Delta H (hydration) :-

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  6. Delta H for the reaction, I((g))+I((g))rarr I(2(g)) will be :-

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  7. Given that {:(A(s) rarr A(I)," ",Delta H = x),(A(I) rarr A(g)," ...

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  8. The enthalpy change of a reaction does not depend on

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  9. Form the thermochemical reactions. C(graphite) +1//2 O(2)(g) to CO(g...

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  10. If H(2)+1//2O(2)rarr H(2)O , Delta =-68.39 Kcal K+H(2)O+ "water" rar...

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  11. Given C(s)+O(2)(g)rarr CO(2)(g)+94.2 Kcal H(2)(g)+2O(2)(g)rarr CO(2)...

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  12. From the following data, the heat of formation of Ca(OH)(2)(s) at 18^(...

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  13. If H(2)(g) + Cl(2)(g) rarr 2HCl, Delta H^(@) = -44 kcal" "…..(i) ...

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  14. In the reaction : S+3//2O(2) rarr SO(3)+"2x kcal" and SO(2) +1//2O(2) ...

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  15. If S+O(2)toSO(2),DeltaH=-298.2 " kJ" " mole"^(-1) SO(2)+(1)/(2)O(2)t...

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  16. Givecn that : Zn+1//2O(2)rarr ZnO+84000 cal ……………1 Hg+1//2O(2)rarr...

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  17. Given that - 2C(s)+2O(2)(g)rarr 2CO(2)(g) Delta H = -787 KJ H(2)(g...

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  18. Find the heat change in the reaction: NH3(g)+HCI(g) to NH4CI(s) fr...

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  19. The heat of reaction of A+(1)/(2)O(2)rarr AO is -50 K call and AO+...

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  20. C(s)+O(2)(g)rarr CO(2)(g)+94.0 K cal. CO(g)+(1)/(2)O(2)(g)rarr CO(2)...

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