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On the basis of thermochemical equations...

On the basis of thermochemical equations (i),(ii) and (iii), which of the algebric relationship is correct.
`C("graphite") + O_(2)(g) to CO_(2)(g), Delta_(r)H = x kJ "mol"^(-1)`
`C("graphite") + 1/2 O_(2)(g) to CO(g), Delta_(r)H = y KJ "mol"^(-1)`
`CO(g) + 1/2O_(2)(g) to CO_(2)(g), Delta_(r)H = z kJ "mol"^(-1)`

A

z = x + y

B

x = y - z

C

x = y + z

D

y = 2z - x

Text Solution

Verified by Experts

The correct Answer is:
C
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On the basic of thermochemical equations (I),(II)and (III), Find out which of the algebraic relationships given in options (a)to (d) is correct ? (I) C("graphite")+O_(2)(g)to CO_(2)(g), Delta_(r)H=XKJmol^(-1) (II) C("graphite")+(1)/(2)O_(2)(g)toCO(g), Delta_(r)H=yKJ mol^(-1) (III) CO(g)+(1)/(2)O_(2)(g)toCO_(2)(g), Delta_(r)H=zKJ mol^(-1)

With the help of thermochemical equations given below, determine Delta_(r )H^(Θ) at 298 K for the following reaction: C("graphite")+2H_(2)(g) rarr CH_(4)(g),Delta_(r )H^(Θ) = ? C("graphite")+O_(2)(g) rarr CH_(2)(g), Delta_(r )H^(Θ) = -393.5 kJ mol^(-1) ...(1) H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(l) , Delta_(r )H^(Θ) = -285.8 kJ mol^(-1) ...(2) CO_2(2)(g)+2H_(2)O(l) rarr CH_(4)(g)+2O_(2)(g) , Delta_(r )H^(Θ) = +890.3 kJ mol^(-1) ...(3)

MODERN PUBLICATION-THERMODYNAMICS-Competition File MCQ
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  5. The enthalpy of vaporisation of liquid water using data H(2)(g) + 1/...

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  6. Given that C+ O(2) to CO(2) DeltaH^(@) = -x kJ 2CO+ O(2) to 2CO(2...

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  8. When 5 g of sulphur is burnt to SO(2), 46 kJ of heat is liberated. Wha...

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  10. A cylinder of gas supplied by Bharat Petroleum is assumed to contain 1...

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  11. The enthalpy of hydrogenetaion of cyclohexene is -119.5 kJ "mol"^(-1)...

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  12. What would be the heat released when an aqueous solution containing 0....

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  13. If the bond dissociation energies of XY,X(2) and Y(2)( all diatomic mo...

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  14. The enthaplpy changes state for the following processes are listed bel...

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  15. The entropy change can be calculated by using expression DeltaS = (q(r...

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  16. For which of the following reactions, DeltaS is not positive :

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  17. If equilibrium constant for a reaction is K, then standard free energy...

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  18. For a reversible process at equilibrium, the change in entropy may be ...

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  19. Free energy change is related to enthalpy and entropy changes as:

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  20. For a spontaneous reaction, DeltaG should be :

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