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For the combustion reaction at 298K 2A...

For the combustion reaction at `298K`
`2Ag(s)+1//2O_(2)(g) rarr 2Ag_(2)O(s)`
Which of the following alternatives is correct?

A

`DeltaH = DeltaU`

B

`DeltaH gt DeltaU`

C

`DeltaH lt DeltaU`

D

`DeltaH` and `DeltaU` bear no relation with each other

Text Solution

Verified by Experts

`DeltaH = DeltaU +DeltanRT`
`Deltan = n_(P) - n_(R)`
`:. Deltan = 2 - (5)/(2) =- (1)/(2)`
`:. DeltaH = DeltaU -(1)/(2)RT`
`:. DeltaU = DeltaH +(1)/(2)RT`
or `:. DeltaU gt DeltaH`
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CENGAGE CHEMISTRY-THERMODYNAMICS-Exercises (Single Correct)
  1. The enthalpy change for chemical reaction is denoted aas DeltaH^(Theta...

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  2. Which of the following equations corresponds to the enthalpy of combus...

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  3. For the combustion reaction at 298K 2Ag(s)+1//2O(2)(g) rarr 2Ag(2)O(...

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  4. For the equations C("diamond") +2H(2)(g) rarr CH(4)(g) DeltaH(1) C...

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  5. The expression Delta("sub"1)H^(Theta) =Delta(fus)H^(Theta) +Delta(vap)...

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  6. The word 'standard' in standard molar enthalpy change implies

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  7. For which of the following equations, will DeltaH be equal to DeltaU?

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  8. The enthalpy change for chemical reaction is denoted aas DeltaH^(Theta...

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  9. Enthalpy chane of a reaction with be equal to

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  10. The molar enthalpies of combustion of C(2)H(2)(g), C("graphite") and H...

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  11. The relationship between enthalpy and internal energy change is

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  12. The equilibrium state is attained when the reversible reaction is carr...

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  13. The relationship between the free energy change (DeltaG) and entropy c...

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  14. For the gaseous reaction involving the complete combustion of isobutan...

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  15. Entropy of system depends upon

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  16. For the gaseous reaction: N(2)O(4) rarr 2NO(2)

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  17. For the reversible process, the value of DeltaS is given by the expres...

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  18. For a process H(2)O(s) rarr H(2)O(l) at 273 K

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  19. i. At absolute zero the entropy of a perfect crystal is zero. This sta...

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  20. In which of the following process DeltaH and DeltaU are of same magnit...

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